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Hohlfeld, DE

Andreas Hohlfeld, Porta Westfalica DE

Patent application numberDescriptionPublished
20110065909SYNTHESIS OF OLIGONUCLEOTIDES - A method for preparing an oligonucleotide comprising the steps of03-17-2011

Andreas Hohlfeld, Porta Westlalica DE

Patent application numberDescriptionPublished
20100087635PURIFICATION OF OLIGONUCLEOTIDES - A method for purifying a protected oligonucleotide comprising the steps of: 04-08-2010

Andreas Hohlfeld, Halle/westfalen DE

Patent application numberDescriptionPublished
20100081802Synthesis of Phosphitylated Compounds Using a Quaternary Heterocyclic Activator - A method for preparing a phosphitylated compound comprising the step of: -reacting hydroxyl containing compound with a phosphitylating agent in the presence of an activator having the formula (I) wherein R=alkyl, cycloalkyl, aryl, aralkyl, heteroalkyl, heteroaryl R04-01-2010

Markus Hohlfeld, Rheine DE

Patent application numberDescriptionPublished
20100077715Agricultural harvesting machine - A self-propelled agricultural harvesting machine, includes an agricultural front attachment which is supported via at least one carrier wheel which is in contact with a ground; at least one height-adjustable pick-up device for adapting said agricultural front attachment; and a control device controlling a ground pressure of said at least one carrier wheel on the ground that results when said front attachment assumes a non-working position.04-01-2010

Olaf Hohlfeld, Warstein DE

Patent application numberDescriptionPublished
20090243089MODULE INCLUDING A ROUGH SOLDER JOINT - A module includes a metallized substrate including a metal layer, a base plate, and a joint joining the metal layer to the base plate. The joint includes solder contacting the base plate and an inter-metallic zone contacting the metal layer and the solder. The inter-metallic zone has spikes up to 100 μm and a roughness (R10-01-2009
20100068552MODULE INCLUDING A STABLE SOLDER JOINT - A solder includes a soft solder having a melting point less than 450° C. and particles embedded in the soft solder. Each particle has a maximum length greater than 50 μm. The particles comprise greater than 10 Vol % and less than 60 Vol % of the solder.03-18-2010
20100252922Power Semiconductor Module, Power Semiconductor Module Assembly and Method for Fabricating a Power Semiconductor Module Assembly - The invention relates to a power semiconductor module including a power semiconductor chip arranged on a substrate and comprising a bottom side facing the substrate, a top side facing away from the substrate, and an electrical contact face arranged on the top side. A bond wire is bonded to the contact face. At least when the power semiconductor module is fastened to a heatsink, a contact pressure element creates a contact pressure force (F) acting on a sub-portion 10-07-2010
20100284153Twist-Secured Assembly of a Power Semiconductor Module Mountable on a Heat Sink - A power semiconductor module system includes a power semiconductor module, a heat sink and at least one fastener. The power semiconductor module includes a bottom side with a first thermal contact surface and the heat sink includes a top side with a second thermal contact surface. The power semiconductor module is conjoined with the heat sink by means of the at least one fastener. The power semiconductor module includes a number N11-11-2010
20100284155Power Semiconductor Module Including Substrates Spaced from Each Other - The invention relates to a power semiconductor module including a module underside, a module housing, and at least two substrates spaced from each other. Each substrate has a topside facing an interior of the module housing and an underside facing away from the interior of the module housing. The underside of each substrate includes at least one portion simultaneously forming a portion of the module underside. At least one mounting means disposed between two adjacent substrates enables the power semiconductor module to be secured to a heatsink.11-11-2010
20100302741POWER SEMICONDUCTOR MODULE FEATURING RESILIENTLY SUPPORTED SUBSTRATES AND METHOD FOR FABRICATING A POWER SEMICONDUCTOR MODULE - The invention relates to a power semiconductor module including a module housing and at least one substrate populated with at least one power semiconductor chip. The module housing has a bottom side and a top side spaced away from the bottom side in a positive vertical direction. In addition, the substrate has a bottom side facing away from an interior of the module housing. The substrate is arranged in an opening of the module housing configured in its bottom side and attached to the module housing by a resilient bonding agent for freedom of movement of the substrate parallel to the vertical direction in relation to the module housing. In the non-mounted condition of the power semiconductor module, the substrate assumes a resting position in relation to the module housing. To deflect the substrate from the resting position parallel to the vertical direction, a deflection force of 0.1 N to 100 N per mm is applied.12-02-2010
20110053319Method for Fabricating a Circuit Substrate Assembly and a Power Electronics Module Comprising an Anchoring Structure for Producing a Changing Temperature-Stable Solder Bond - A power semiconductor module is fabricated by providing a circuit substrate with a metal surface and an insulating substrate comprising an insulation carrier featuring a bottom side provided with a bottom metallization layer. An anchoring structure is provided comprising a plurality of oblong pillars each featuring a first end facing away from the insulation carrier, at least a subset of the pillars being distributed over the anchoring structure in its entirety, it applying for each of the pillars of the subset that from a sidewall thereof no or a maximum of three elongated bonding webs each extend to a sidewall of another pillar where they are bonded thereto. The anchoring structure is positioned between the insulation carrier and metal surface, after which the metal surface is soldered to the bottom metallization layer and anchoring structure by means of a solder packing all interstices between the metal surface and bottom metallization layer with the solder.03-03-2011

Patent applications by Olaf Hohlfeld, Warstein DE