| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 047650500 |
RECEPTACLE FOR GROWING MEDIUM
| 357 |
| 047059000 |
WATER CULTURE, APPARATUS OR METHOD
| 102 |
| 0475801R0 |
PROCESS
| 91 |
| 047200100 |
COVER, SHADE, OR SCREEN
| 61 |
| 047017000 |
GREENHOUSE, APPARATUS OR METHOD
| 48 |
| 047480500 |
PLANT IRRIGATORS AND/OR FERTILIZERS, APPARATUS OR METHOD
| 45 |
| 047044000 |
PLANT SUPPORTS
| 44 |
| 047100400 |
ALGAE CULTURE
| 28 |
| 047410010 |
FLOWER HOLDER
| 28 |
| 047009000 |
MULCHING
| 20 |
| 047033000 |
ORNAMENTAL BEDS
| 16 |
| 047570600 |
COATED OR IMPREGNATED SEED, METHOD OR APPARATUS
| 15 |
| 047100100 |
MUSHROOM CULTURE
| 14 |
| 047039000 |
STAND FOR HOLDING A PLANT OR GROWING MEDIUM RECEPTACLE
| 13 |
| 047042000 |
TREE SUPPORTS
| 10 |
| 047065000 |
DYNAMIC PLANT RECEPTACLE TRANSPORT, APPARATUS OR METHOD
| 10 |
| 047100500 |
PLANT SURFACE CONTACT MATERIAL APPLICATOR
| 7 |
| 047400500 |
TREE TRUNK SUPPORTING BASE WITH LIQUID RESERVOIR
| 7 |
| 047570500 |
INJECTION, METHOD OR APPARATUS
| 6 |
| 047056000 |
SEED TAPE OR MAT, METHOD OR APPARATUS
| 6 |
| 047002000 |
FROST PREVENTING | 5 |
| 20110289833 | PROTECTIVE COLD FRAME FOR PLANTS - Disclosed herein is a plant-protecting device which is commonly known as a protective cold frame. While this description seems to indicate a frame-like device, the described device is intended to refer not only to the frame but also to a wind and thermal protective covering generally configured to hold heat therein to protect a plant therein from cold, wind, and the combination. In general, the disclosed device comprises a plurality of rod members that may be bendable, which are inserted into a coupler at the apex of the dome-shaped frame to provide a support structure for a cylindrical covering to be placed thereupon. | 12-01-2011 |
| 20090205248 | Frost Guard and Method of Use Thereof - A frost guard that is light weight, transparent and easily compacted facilitating storage and transport. The frost guard has an inverted U-shaped frame and a transparent, flexible plastic sheet over the frame, wherein the sheet protects plants under the frost guard from excessive wind and moisture, thereby preventing frost damage to the plants. The frame is placed over the plants to be protected, such that only slight air flow occurs through C-shaped apertures in the plastic sheet. | 08-20-2009 |
| 20090077872 | System and Apparatus for Preventing Freezing of Crops - A system for preventing freezing of crops within a volume includes a plurality of RF radiators configured to radiate RF energy into the volume. A height, a spacing, an output power, a vertical beam angle, a vertical beam width, and a horizontal beam width of each one of the plurality of RF radiators is selected to result in an average RF power density taken about three dimensions within the volume sufficient to prevent freezing of a substantial portion of the crops, and also to result in a peak-to-peak variation of RF power density taken about two dimensions in a horizontal plane within the volume and at heights below a predetermined height to be less than a predetermined percentage of an average RF power density taken about the two dimensions. | 03-26-2009 |
| 20110247264 | TRELLIS SYSTEM FOR FOR IRRIGATION AND FROST PREVENTION - A trellis mounted system for irrigation and frost prevention is described. The irrigation system comprises a trellis, a first conduit coupled to the trellis, and a second conduit coupled to the trellis. The first conduit delivers a heated water stream to a nozzle that provides a heated water spray to an area surrounding the trellis. The second conduit provides drip irrigation to a ground area surrounding the trellis. The heated water supplied by the trellis mounted irrigation system prevents the development of damaging frost on agricultural plants. | 10-13-2011 |
| 20110247263 | CONTROL METHOD AND APPARATUS OF WIND MACHINE FOR PLANT FROST PROTECTION - This invention relates to control method and apparatus of wind machine for plant frost protection, and belongs to the domain of agro-meteorological disaster monitoring and control. Existing wind machines for plant frost protection only rely on critical damage temperature or wind speed as a condition to start. If there is no thermal inversion, operation of the wind machine will aggravate freezing injury to plants. If the strength of thermal inversion is weak, the effect will be minimal The feature of this invention is that when temperature at the plant canopy is lower than the critical damage temperature of a certain plant and temperature difference between the top and bottom of the thermal inversion layers exceeds set threshold, wind machine will start automatically. Otherwise it will remain off. The control apparatus mainly consists of sensor | 10-13-2011 |
| 047100430 |
CROP THINNING, INCLUDING FRUIT, FOLIAGE, OR MOSS REMOVAL | 5 |
| 20100281770 | METHOD AND APPARATUS FOR STRIPPING MATERIAL FROM A LINE - A method and apparatus ( | 11-11-2010 |
| 20090272029 | Methods for Treating Live Plants or Live Plant Parts or Mushrooms with UV-C Light - The present invention relates to a method for controlling pathogen growth on live plants and mushrooms using UV-C light and an apparatus for use in the method. Also provided are methods for removing surplus leaves and methods for destroying aerial plant parts prior to harvest of underground roots, tubers or bulbs. | 11-05-2009 |
| 20110283609 | Apparatus and Method for Killing Unwanted Vegetation - Apparatus for killing unwanted vegetation using heated water comprises a refillable compressed air tank, a refillable water tank, a shut-off valve operably installed on a connection conduit between the compressed air tank and the water tank for select opening and closing of the conduit to respectively allow and prevent flow between the tanks, a flexible hose connected to the water tank, an applicator wand connected to the flexible hose opposite the water tank and comprising a rigid delivery conduit terminating at a discharge end of the applicator wand and a normally closed control valve on the applicator wand to selectively and temporarily open to control discharge of heated water from the water tank under air pressure from the air tank. The apparatus is used to inject heated water beneath a spot of ground surface from which unwanted vegetation has emerged | 11-24-2011 |
| 20090013594 | Lawn care device - A lawn care device includes a first generally flat member. A second generally flat member is hingedly connected along a first predetermined side edge thereof to a first predetermined side edge of such first generally flat member. A third generally flat member is hingedly connected along a first predetermined side edge thereof to a second predetermined side edge of such first generally flat member. An aperture is formed closely adjacent to a predetermined top edge of such first generally flat member and disposed therethrough. A first cut out portion is formed along a second predetermined side edge of such second generally flat member for alignment with such aperture. A second cut out portion is formed along a second predetermined side edge of such third generally flat member for alignment with such aperture. | 01-15-2009 |
| 20090255174 | Landscaping device - The present invention includes a landscaping apparatus for inhibiting plant growth on the ground, the apparatus containing a member including an elongated strip having a longitudinal axis and sides spaced apart from the longitudinal axis, wherein the longitudinal axis and the sides are substantially within a plane containing the member when the member is substantially flat. One or more projections extend from the member and are used to fix the member to the ground by inserting the projections into the ground. In one embodiment, the projections are integrally formed with the member and the member is made from a substantially flexible material. | 10-15-2009 |
| 047320700 |
ROOT TRAINER, OR BARRIER | 5 |
| 20100000149 | Coir Fibre Rope, Plant Liner, Pot and Insulating Product - A tree liner is formed from a composition of a sheet of brown coir to which a latex mixture is applied, preferably by spraying. The tree-liner may be inserted in a wire basket and used to wrap, cover and/or protect the roots of young trees and bushes during the lifting, preparation, packaging and shipping process from the nursery to the final user. The tree-liner comprises approximately 80% coir and 20% latex composition by weight. There is also provided a standalone plant container formed from a sheet of the same coir/latex composition. The composition may also be used for bedding, insulation and other various applications. | 01-07-2010 |
| 20110289834 | WEED CONTROL AND ROOT BARRIER - A polyolefin sheet material carries layered segments of a polymer which contains a herbicide such as a 2,6-dinitroaniline. The sheet material can be porous to permit free passage of water. It may be either a perforated sheet or a woven or non-woven material. A desired material is a non-woven fabric of non-biodegradable polyolefin material, such as a geotextile, for example. In order to obtain a root growth-repelling property, the herbicide is blended with a polymer which is attached or bonded to or embedded in the geotextile, or other polyolefin carrier sheet material, in the form of spaced apart layered segments. Diffusion of the herbicide directly into the soil is prevented by a barrier material positioned on, coated on, or otherwise bonded to the layered segments, to encompass surfaces of the segments which are otherwise exposed on the sheet material. Essentially all of the herbicide contained in the layered segments is directed into the soil virtually exclusively by means of its long term migration through the carrier sheet material. | 12-01-2011 |
| 20080216400 | Plant culture container structure - The present invention discloses an improved plant culture container structure that includes a container having a containing groove; a plurality of vertical root guiding lines disposed with a specific vertical distance from each other and formed on an internal wall of said container; and one or more horizontal root guiding lines disposed around the internal wall of the container and coupled to the internal wall of said container, for restricting the root of the plant to grow downward to strengthen and secure the plant into the soil. | 09-11-2008 |
| 20080307701 | Plant cultivation structure, root-preventing structure and root-preventing sheet used in them - To realize a root-preventing sheet with outstanding shape maintaining properties while being thin and light that even when affixed has no wrinkles, is difficult to tear, has excellent applicability, durability and adhesiveness and demonstrates definite root-preventing effects at low cost. | 12-18-2008 |
| 20110232175 | REUSABLE PLANT CONTAINER APPARATUS - The invention is a plant container for growing and transplanting plants. More, specifically, the invention is for a plant container that is made of a multi-layered root impenetrable material with a plurality of closure mechanisms that allows a user to more easily remove and transplant a plant as well as monitor plant root growth. | 09-29-2011 |
| 047006000 |
GRAFTING | 4 |
| 20090277081 | APPARATUS AND METHOD FOR CULTIVATING A TREE - An apparatus and method cultivate trees by preventing freezing and frost damage and inhibiting root stalk sprouts. The apparatus is a frustoconical cover that rests on the ground to cover the root ball of the tree. The stalk and leaves are extended from a hole in the frustum. Water such as mist is injectable within the cover to prevent cold and frost damage. | 11-12-2009 |
| 20110126453 | NEW METHOD FOR THE PRODUCTION OF SOMATIC EMBRYOS FROM EUPHORBIA PULCHERRIMA PLANT TISSUE - The present invention relates to a method for the production of somatic embryos from poinsettia ( | 06-02-2011 |
| 20110154730 | GRAFTED SEEDLING PRODUCING DEVICE - A grafted seedling producing device including a stock seedling holding unit that holds and conveys a stock seedling, a stock cutting unit that cuts the stock seedling held by the stock seedling holding unit, and a joining unit that joins the stock seedling conveyed by the stock seedling holding unit and a scion seedling, the stock cutting unit including a stock cutter unit that includes a stock blade for cutting the stock seedling by a predetermined stock cutter trajectory, the stock seedling holding unit holding an embryonic stem of a seedling for grafting at a predetermined position on the stock cutter trajectory in a vertical posture, the grafted seedling producing device includes: a supporting unit configured to retract the stock cutter unit from an advance position for cutting in proximity to the stock seedling holding unit; and a stock pressing member that presses and fixes a portion ahead of a cutting position of the embryonic stem from a seedling holding position against the stock seedling holding unit side at the advance position. | 06-30-2011 |
| 20110005127 | TECHNIQUE FOR ENGRAFTING PLANTS AND A TOOL FOR IMPLEMENTING THE TECHNIQUE - Material is mechanically removed from the cut-out extremities of the graft holder ( | 01-13-2011 |
| 047050000 |
SAP BUCKETS | 4 |
| 20100170152 | Maple spout with interior chamber and maple syrup production system using same - A maple syrup production spout with an interior chamber is disclosed. The spout is designed for use with vacuum-based maple syrup production systems. The interior chamber serves as a reservoir that allows the vacuum to accumulate, thereby facilitating the flow of sap from the tap hole, through the spout and into the dropline. The interior chamber also facilitates reduced liquid-liquid contact between the tubing system and the taphole, which improves the cleanliness of the tap hole and increases sap yield. Methods of using the spout in maple syrup production system are also disclosed. | 07-08-2010 |
| 20110088316 | TUBING, A SYSTEM CONTAINING TUBING FOR AND METHOD FOR REMOVING SAP FROM A TREE - A system for removing sap from a plurality of trees includes a main tube supported at least in part by a plurality of drain tubes without the use of a spinal support. The main tube as supported can negotiate a path between a plurality of trees. The drain tubes are adapted to be supported at the trees. The drain tubes are in fluid communication with the main tube for removing sap through a drain tube into the main tube. | 04-21-2011 |
| 20110173881 | Dual-line spout and maple syrup production system using same - A dual-line spout for maple syrup production is disclosed. The spout has a nose section with an input channel, and an interior chamber having first and second flow paths each fluidly connected to the input channel and to respective first and second output channels. The spout is designed for use with vacuum-based maple syrup productions systems that use a dual-line line system. The dry-line portion of the line system fluidly connects to the first output channel and the wet-line portion of the line system fluidly connected to the second output channel. Example spouts have no chambers, a single chamber or two sub-chambers, to facilitate air-liquid separation. Methods of using the spout in a vacuum-based, dual-line maple syrup production system are also disclosed. | 07-21-2011 |
| 20110173880 | Maple syrup line system with increased diameter lines and fittings - A line system for a maple syrup production system, where the lateral lines have an inside diameter greater than 5/16″ nominal and less than or equal to ¾″ and the lateral line fitting and mainline fitting have a nominal inside diameter of greater than 0.225″ and less than or equal to 0.70″. Further, the line system has drop lines with an inside diameter greater than 5/16″ nominal and less than or equal to ¾″ and the spout fitting has a nominal inside diameter of greater than 0.225″ and less than or equal to 0.70″. The increased inside diameters of the drop lines, lateral lines, spout fittings, lateral line fittings and mainline fittings dramatically improves the flow of air and sap from the taphole and through the line system. | 07-21-2011 |
| 047320400 |
TREE TRUNK GUARD OR PROTECTOR | 3 |
| 20110258923 | THERMOFORMED GROW TUBE - A grow tube formed from a sheet of thermoform polymer to include a plurality of longitudinal ribs that protrude in a first direction normal to the plane of the sheet. When rolled into a grow tube, the ribs can extend radially inward and act as cushions that prevent the stem of the resident plant from colliding with or resting on the continuous rim of the grow tube. The ribs can also define vertically oriented channels that are open to the interior of the grow tube. Natural convection currents develop in the channels, promoting air exchange between the interior of the grow tube and the surroundings. The ribs can promote diffusion of the incoming sunlight. In one embodiment, the grow tube includes snap forms that overlap when the sheet is rolled into tubular form to provide a flangeless grow tube. | 10-27-2011 |
| 20100005713 | Pest repelling tree collar devise for keeping pests away from trees & plants - A device is described for repelling pests from fruit and other trees as well as certain plants. The device consists of an adjustable collar that is strapped tight around the tree trunk, tree branches or plant stem. The collar consists of a liquid absorbing foam strip and a tying mechanism such as a pipe clamp, or Velcro strap. To be most effective, the foam strip should completely surround the tree trunk or plant stem so as to not allow any way of passage for ants and other tree-crawling pests to make it through the repelling barrier without having to crawl over it. A repellant or insecticide is poured on top of the collar's foam strip. Thus a repelling barrier is created that crawling pests will not cross or that causes a repelling aroma to engulf the tree or plant and which repels flying insects. | 01-14-2010 |
| 20090235581 | Apparatus to prevent climbing a vertically disposed member - An apparatus to prevent climbing a vertically disposed member is provided. The apparatus includes a covering member manufactured from a predetermined material and having a predetermined shape, a predetermined thickness, and a predetermined size. A securing mechanism is operably connected to such covering member at a predetermined location thereon for securing such covering member at least one of to and around a predetermined object such that such object is rendered substantially incapable of being climbed upon at the location covered by the covering member. | 09-24-2009 |
| 047570700 |
COATING, DUSTING, OR HOT OR COLD FOGGING MACHINE OR METHOD | 2 |
| 20110232177 | SYSTEMS FOR THE CONTROL AND USE OF FLUIDS AND PARTICLES - The configuration of a feedstock material is controlled by bringing it into contact with at least a first gas moving against it at a location with an area and thickness of the feedstock liquid that forms drops or fibers of a selected size. In one embodiment, drops of agricultural input materials are formed for spraying on agricultural fields. In another embodiment, nanofibers of materials such as chitosan or metals are formed. In another embodiment seeds are planted with gel. In another embodiment particles carrying desired agricultural inputs with modified release characteristics are delivered. | 09-29-2011 |
| 20120017503 | METHOD FOR REDUCING SUNBURN DAMAGE IN PLANTS - The present invention relates to methods, use and compositions for reducing sunburn damage in plants. More specifically, it relates to methods and compositions for controlling, preventing, or treating sunburn damage using UV filters. | 01-26-2012 |
| 047100300 |
ELECTROCULTURE, MAGNETOCULTURE OR ELECTROCUTING | 2 |
| 20110283607 | METHOD FOR THE TREATMENT OF PLANTS USING ELECTROMAGNETIC FIELDS - The invention relates to a method for the treatment of plants using electromagnetic fields and consists in applying pulse sequences to growing plants or the seeds thereof in a pulsed electromagnetic field by means of a pulse generator, wherein the individual pulses have a frequency ranging from 1 to 100 Hz and the amplitude of each individual pulse corresponds to an exponential function or the pulses have envelope curves rising and falling in the form of an arc, wherein the individual pulses are emitted in synchronous or asynchronous groups of pulses having different magnetic flux densities, and wherein the plants are exposed to the pulsating electromagnetic field once to 30 times a day for 1 to 120 minutes each time or continuously for several days. Plant growth, germination and yields are significantly increased in an environmentally friendly manner. Resistance to diseases is increased. | 11-24-2011 |
| 20120023815 | Enriching the Seed Quality of a Batch of Seeds - The invention is directed to a method for separating two or more seed fractions having different germination quality, to a method for preparing a seed fraction enriched in seed quality, and to the use of a magnetic fluid. | 02-02-2012 |
| 047089000 |
FOR POTATO, METHOD OR APPARATUS | 2 |
| 20090077883 | Controlled Environment System and Method for Rapid Propagation of Seed Potato Stocks - A computer controlled environment system and method are used to provide the optimum environmental and nutritional conditions for the growth and development of seed potato cuttings for the initiation and development of tubers that can be used as the seed source for further multiplication under field conditions as seed potato stock. Use of a controlled environment system and method that provides optimum cultural conditions results in rapid growth and development of the potato cutting so as up to six crops of tubers can be harvested in a calendar year. | 03-26-2009 |
| 20100064582 | METHOD FOR MASS PRODUCTION OF SEEDLING OF SEED POTATO - A method of mass producing potato seedlings, involves collecting growing points of seed potatoes and culturing the growing points in a liquid or solid medium; introducing in vitro plantlets obtained from the culture of the growing points to solid culture; and removing the in vitro plantlets from the solid culture, and planting through stem cutting and acclimatizing the in vitro plantlets in deep flow culture, in which a nutrient solution is circulating. Upon planting in hydroponic facilities, such potato seedlings have high adaptability to the external environment and thus rapidly, uniformly generate roots in a short time. The rapid root anchoring prevents planted seedlings from withering, leading to death, growing poorly, and the like. The direct planting of in vitro plantlets through stem cutting without a separate acclimatization process shortens the overall production period of potato seedlings by omitting the acclimatization process. | 03-18-2010 |
| 047014000 |
SEED TESTERS | 2 |
| 20090260281 | METHOD FOR GROUPING A PLURALITY OF GROWTH-INDUCED SEEDS FOR COMMERCIAL USE OR SALE BASED ON TESTING OF EACH INDIVIDUAL SEED - A method and system for producing a group of growth-induced seeds for commercial use or sale, the method including monitoring a physiological indication and/or morphometric indication for a seed, automatically determining if the monitored seed has a specific characteristic, separating the monitored seed having the specific characteristic into a group of seeds for commercial use or sale so that each and every seed in the group has been monitored and determined to have the specific characteristic. | 10-22-2009 |
| 20090077873 | Seed testing method and apparatus - To provide an accelerated aging seed testing kit system, a single sheet of plastic or other suitable formable sheet material is pressed into the shape of a compartment base having recesses for mounting a seed holder. A seed holder that includes a seed support and a seed support holder is formed. The seed support holder is formed of a single sheet of plastic having radially extending tabs that fit into the recesses of the container to support the seed support above the bottom of the test kit. A bypass channel for addition of an aqueous solution used in the prescribed test condition is provided in the seed holder. A lid is formed out of one piece of plastic having a bendable tab to serve as a port and the openings and connecting points of the lid and seed holder are positioned so they can only fit together in one orientation having the port above the bypass channel. | 03-26-2009 |
| 047018000 |
BENCH OR ELEVATED BED, HOTBED | 1 |
| 20090077876 | Expandable plant growing frame tray and pots - An expandable plant growing frame is disclosed. The expandable growing frame includes a unique tubular joiner that works with standard tubing to allow the frame to grow to accommodate growth of a nursery. The tubular joiner can be shipped and assembled using locally available plastic tubing. The tubular joiners are usable to create an expandable table for purposes including but not limited to growing tables, display tables and dining tables. A tray is disclosed that rests on the tubular frame and allows for an expandable planting table. Elongated pots are also disclosed that provide the equivalent volume as more standard sized round pots. The elongated pots can interconnect to making it easier to carry a number of pots. The pots nest within the tray to increase the quantity of plants that are grown at one time. | 03-26-2009 |
| 047100410 |
POLLINATION AIDS | 1 |
| 20090000187 | Method and apparatus of high-throughout pollen extraction, counting, and use of counted pollen for characterizing a plant - An apparatus and method of quantitatively obtaining a measurement of pollen of a plant. A quantitative collection of a sample of pollen is counted. Total pollen of the plant can be calculated. One way of quantitative collection of pre-shed pollen involves blending a part of the plant with pollen in the presence of liquid (e.g. water) in a blender. The action of the blender tends to destroy the non-pollen parts of the plant and release the pollen into the liquid. Extraction of the pollen from the blender can be through a sidewall port that includes a filter or sieve having a mesh size that passes relevant pollen but blocks most non-pollen plant parts. The sample can be efficiently prepared for counting of pollen. One method of counting comprises imaging the sample with the pollen well distributed in the focal plane of the imager. | 01-01-2009 |
| 047500500 |
LAYERING | 1 |
| 20110067297 | APPARATUS AND METHOD FOR HOLDING ROOTING MEDIA - A wrap for use in air-layering made from a long tubular plastic net sack filled with a rooting media. The sack is used for secure placement of the rooting media about the plant surface. Furthermore, a method for air layering large woody plant is provided that comprises of placing the wrap containing the rooting media, over the plant surface. | 03-24-2011 |
| 047008000 |
TREE SURGERY | 1 |
| 20110041396 | Convex Cutting and Trimming Method for Shaping Trees - A tree trimming method that is related to a convex method of angular trimming of trees. The methodology uses angle cuts for tree trimming and shaping of all shade trees, evergreen trees, and ornamental trees. The angle cutting of limbs is in a “convex cut”. This makes curved cuts bring the tree limbs in a radial shape and encourages them to grow which results in the tree canopy to be round or radial in shape. Angle cutting proves useful either on the outside perimeter or useful in vertical clearing inside the tree canopy for clearance (for power lines and such). Essentially any angle of clearing or directional shaping can be done with this of cutting method—under the canopy, on the sides, at the top, or clearing pathways through the middle without damage to the trees. | 02-24-2011 |
| 047100700 |
MATERIAL DISTRIBUTOR WITH PLANT MANIPULATING, CULTIVATING OR SENSING (E.G., TO POSITION PLANT RELATIVE TO DISTRIBUTOR) | 1 |
| 20110296750 | ROLLING HERBICIDE APPLICATOR AND SHIELD - A rolling herbicide applicator contains an herbicide nozzle fastened to a rigid shaft and axle at the center of a rolling disc for selectively applying herbicide to undesirable plants, while shielding desirable plants from herbicide overspray. The rolling applicator allows a user to trace a flowing outline through landscape arrangements of any shape with a steady movement as the rolling disc proceeds along the outline. The open design simultaneously provides the operator a direct and continuous view of the sprayer in operation. | 12-08-2011 |
| 047100440 |
FLAME CULTIVATING | 1 |
| 20100024291 | THERMAL WEED CONTROL - The invention concerns a weed control apparatus and a method for thermal weed control, wherein the weed control apparatus has a heating area to which is supplied secondary air, where the secondary air is preheated before introducing it to the heating area, where preheating of the secondary air is preferably effected by conducting it through a preheating area, where the preheating area includes one or more ducts which are preferably only separated from the heat exposure area by a heat conducting material, e.g. an iron sheet. The preheating of the secondary air with heat from the heat exposure area firstly contributes to recycling of the heat that otherwise would radiate off the top side of the apparatus. | 02-04-2010 |
