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Class Information
Number: 55/DIG.13
Name: Gas separation > Polyurethane filters
Description:










Patents under this class:

Patent Number Title Of Patent Date Issued
7674306 Multilayered long life filter using convoluted foam Mar. 9, 2010
6833022 Method and device for filtering contaminated air Dec. 21, 2004
6238464 Method and apparatus for separating droplets for particles from a gas stream May. 29, 2001
6197079 Pleated air filter and method for producing same Mar. 6, 2001
6109902 Liquid-injected compressor with at least two cooperating compressor elements Aug. 29, 2000
5961678 Filter drainage layer attachment Oct. 5, 1999
5871569 Filter material Feb. 16, 1999
5820644 Air filter Oct. 13, 1998
5807424 Regenerative adsorption filter bed for exhauster hoods Sep. 15, 1998
5573811 Air filter and method of construction Nov. 12, 1996
5288298 Antimicrobial air filter and method of making same Feb. 22, 1994
5230799 Filter frame Jul. 27, 1993
5186619 Flow rate regulating mechanism for gas lighters and similar devices and method of producing a microcell polymer filter for use therein Feb. 16, 1993
5002597 Aerodynamic filter Mar. 26, 1991
4981501 Adsorption filter with high air permeability Jan. 1, 1991
4925468 Filter device provided in an air conditioning device May. 15, 1990
4680040 Multipurpose filtering material Jul. 14, 1987
4666479 Semiconductor wafer container May. 19, 1987
4631077 Foam plastic air filter Dec. 23, 1986
4631297 Antimicrobially effective organic foams and methods for their preparation Dec. 23, 1986
4605526 Process for producing dense membranes Aug. 12, 1986
4519816 Method for the recovery of solvent vapors May. 28, 1985
4425145 Multi-stage air filter Jan. 10, 1984
4293378 Enhanced wet strength filter mats to separate particulates from fluids and/or coalesce entrained droplets from gases Oct. 6, 1981
4193779 Air filtering apparatus Mar. 18, 1980
4179246 Crankcase vent apparatus and method Dec. 18, 1979
4178161 Manufacture of rigidized convoluted foam from flexible polyurethane foam and resultant product Dec. 11, 1979
4153505 Sorbent materials May. 8, 1979
4137647 Heat and humidity recovery device for use with clothes dryer Feb. 6, 1979
4099943 Composite fluid filtering medium and method of making Jul. 11, 1978











 
 
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