Patent application number | Description | Published |
20090046494 | Semiconductor memory device - Disclosed herein is a semiconductor memory device which prevents the voltage of a select bit line from being reduced due to the action of coupling capacitance between the select bit line and a non-select bit line, reduces current consumption, and enables high speed reading of bit lines. The semiconductor memory device includes a plurality of memory banks, a plurality of second bit lines, a plurality of selector circuits, a voltage supply circuit. Each of the memory banks includes a plurality of first bit lines, a plurality of word lines, and a plurality of memory banks which are installed between the first bit lines and the word lines. The voltage supply circuit holds non-select bit lines of the first bit lines at the GND level at all times. | 02-19-2009 |
20100080055 | SEMICONDUCTOR MEMORY DEVICE - Disclosed herein is a semiconductor memory device which prevents the voltage of a select bit line from being reduced due to the action of coupling capacitance between the select bit line and a non-select bit line, reduces current consumption, and enables high speed reading of bit lines. The semiconductor memory device includes a plurality of memory banks, a plurality of second bit lines, a plurality of selector circuits, a voltage supply circuit. Each of the memory banks includes a plurality of first bit lines, a plurality of word lines, and a plurality of memory banks which are installed between the first bit lines and the word lines. The voltage supply circuit holds non-select bit lines of the first bit lines at the GND level at all times. | 04-01-2010 |
20110290716 | VINYLIDENE FLUORIDE RESIN POROUS FILM AND MANUFACTURING METHOD THEREFOR - A porous membrane of vinylidene fluoride resin, having two major surfaces sandwiching a certain thickness, including a dense layer which governs filtration performance on the one major surface side and a sparse layer which contributes to reinforcement on the other opposite major surface side, and having an asymmetrical gradient network texture including pore sizes which increase continuously from the one major surface to the other opposite major surface, wherein the dense layer includes a 7 μm-thick portion contiguous to the one major surface showing a porosity A | 12-01-2011 |
20120012521 | VINYLIDENE FLUORIDE RESIN HOLLOW FIBER POROUS MEMBRANE AND PROCESS FOR PRODUCING SAME - A hollow-fiber porous membrane of vinylidene fluoride resin, satisfying: a ratio Pmax/Pm of at most 2.0 between a maximum pore size Pmax and an average pore size Pm, and a Pm of 0.13 μm-0.25 μm, according to the half-dry/bubble point method (ASTM F316 and ASTM E1294); a coefficient of variation in outer surface pore size of at most 70%, and a porosity of 75-90%. The hollow-fiber porous membrane has a moderate average pore size, has a pore size distribution which is uniform as a whole and also on the outer surface, and has a high porosity, so that it shows not only a good pure water permeability but also retains a good water permeability even in continuous filtration of cloudy water. The hollow-fiber porous membrane is produced through a process which includes: melt-extruding a vinylidene fluoride resin together with a plasticizer and a good solvent therefor into a hollow-fiber film, cooling and solidifying the film, extracting the plasticizer and good solvent, omitting a heat-treatment for crystallization, and stretching the hollow-fiber after the extraction at a limited temperature range of 80-95° C. which is higher than a conventional stretching temperature. | 01-19-2012 |
20120103895 | VINYLIDENE FLUORIDE RESIN POROUS MEMBRANE, MANUFACTURING METHOD THEREFOR, AND METHOD FOR MANUFACTURING FILTRATE WATER - A porous membrane of vinylidene fluoride resin, including a 10 μm-thick portion contiguous to one surface thereof which comprises network resin fibers having an average diameter of at most 100 nm and shows a porosity A1 of at least 60% as measured by a focused ion beam-scanning electron microscope, and showing a surface pore size of at most 0.3 μm on said one surface thereof. The porous membrane has a treated water side surface layer showing a small surface pore size suitable for water filtration treatment and formed of extremely thin network resin fibers giving an extremely high porosity, thus showing an excellent minute particle-blocking performance and also extremely good anti-soiling resistance and regeneratability. The porous membrane is produced by a process including: melt-extrusion of a composition obtained by adding to vinylidene fluoride resin of a large molecular weight a relatively large amount of a polyester plasticizer which is mutually soluble with the resin and provides the resultant mixture with a crystallization temperature that is substantially identical to that of the vinylidene fluoride resin alone to form film, followed by cooling from one side of the film to solidify the film, extracting the plasticizer and stretching the membrane after the extraction while partially wetting a surface portion thereof. | 05-03-2012 |
20120160764 | POROUS VINYLIDENE FLUORIDE RESIN MEMBRANE AND PROCESS FOR PRODUCING SAME - A porous membrane of vinylidene fluoride resin, comprising a substantially single layer membrane of vinylidene fluoride resin having two major surfaces sandwiching a certain thickness, including a dense layer that has a small pore size and governs a filtration performance on one major surface side thereof, having an asymmetrical gradient network structure wherein pore sizes continuously increase from the one major surface side to the other opposite major surface side, and satisfying conditions: (a) the dense layer includes a 5 μm-thick portion contiguous to the one major surface showing a porosity A | 06-28-2012 |
20150123353 | SPIRAL GASKET - The present invention has an object of providing a spiral gasket that is less influenced by thermal deterioration of a part of members thereof in high-temperature and high-pressure conditions than a conventional spiral gasket and thus is guaranteed to have stable sealing performance for a long time. A spiral gasket includes a sealing portion including a metal hoop member that has a cross-sectional shape including bent parts and is spirally wound around to have a plurality of winds such that the bent parts of the winds overlap one another; and a filler member located between the winds of the metal hoop member in a radial direction. At least a part of the filler member in a spiral direction is formed of a non-iron metal material having high deformability. | 05-07-2015 |
20150126414 | POLYGLYCOLIC ACID RESIN SHORT FIBERS AND WELL TREATMENT FLUID - PGA short fibers having the following characteristics of (a) to (c): (a) strength of 1 to 20 gf/D; (b) a mass loss of at least 10% after 14 days in water at a temperature of 60° C.; and (c) a pH of 1 to 5 after 3 days in water at a temperature of 60° C. with a solid content concentration of 2 mass %. The PGA short fibers preferably further having (d1) an outside diameter of 1 to 120 μm, (e1) a fiber length of 2 to 30 mm, and (f1) a fineness of 0.1 to 25 D, or the PGA short fibers preferably further having (d2) an outside diameter of 1 to 200 μm, (e2) a fiber length of less than 2 mm, and (f2) an aspect ratio of 2 to 1,200. Also, a well treatment fluid containing the PGA short fibers. | 05-07-2015 |