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Class Information
Number: 55/DIG.44
Name: Gas separation > Pile and pile-type filter mediums

Patents under this class:

Patent Number Title Of Patent Date Issued
7896941 Product and method of forming a gradient density fibrous filter Mar. 1, 2011
6071419 Fluid filter, method of making and using thereof Jun. 6, 2000
6068674 Removal of suspended fine particles from gases by turbulent deposition May. 30, 2000
5976209 Melt blown product formed as a fibrous layered web of filter media Nov. 2, 1999
5630856 Self-supporting filter composite May. 20, 1997
5571604 Adsorbent fibrous nonwoven composite structure Nov. 5, 1996
5472467 Self-supporting filter composite Dec. 5, 1995
5273565 Meltblown fabric Dec. 28, 1993
5181945 High-temperature fabric filter media Jan. 26, 1993
4983192 Textile sheet filter Jan. 8, 1991
4976934 Nested, recirculating-fiber filter Dec. 11, 1990
4961974 Laminated filters Oct. 9, 1990
4938869 Spiral wound filter element Jul. 3, 1990
4917714 Filter element comprising glass fibers Apr. 17, 1990
4531957 Filtering material and filtration apparatus employing the filtering material Jul. 30, 1985
4322232 Filter bag and method for suppressing electrostatic charges Mar. 30, 1982
4289510 Internal loading cylindrical filter with unsupported tubular filter fabric Sep. 15, 1981
3977847 Filtration method and apparatus Aug. 31, 1976

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