Claims
- 1. A porous fused polytetrafluoroethylene structure which consists essentially of a porous sheet of particles of granular-type polytetrafluoroethylene, said particles having an average particle size between 1 and 500 microns, said particles fused together in a manner which forms a fused network of interconnected particles having pores between the particles, and in which the particles are packed in a manner which results in a specific gravity of the sheet of between 0.8 and 1.54.
- 2. The structure of claim 1 wherein the particles are composed of a mixture of a) particles of unsintered polytetrafluoroethylene of average particle size of 20-50 microns and b) particles of sintered polytetrafluoroethylene of average size of 30-60 microns.
- 3. A filter element for separation of solids from a fluid stream which consists essentially of:
- (a) a perforate strength member substrate;
- (b) a porous coating covering the substrate which consists essentially of a porous sheet of particles of granular-type polytetrafluoroethylene that are fused together in a manner which forms a fused network of interconnected particles having pores between the particles, said particles having an average particle size between 1 and 500 microns, and in which the particles are packed in a manner which results in a specific gravity of the sheet of between 0.8 and 1.54.
- 4. The filter element of claim 3 wherein the particles of granular-type polytetrafluoroethylene are composed of a mixture of a) particles of unsintered tetrafluoroethylene of average size of 20-50 microns and b) particles of sintered polytetrafluoroethylene of average size of 30-60 microns.
- 5. The filter element of claim 4 wherein the perforate strength member substrate is selected from the class consisting of metal mesh, a porous sintered metal, a woven PTFE-based textile material, a woven polypropylene-based textile material, a non-woven PTFE-based textile material, and a non-woven polypropylene-based textile material.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9007304 |
Mar 1990 |
GBX |
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Parent Case Info
This application is a continuation, of application Ser. No. 07/971,244 filed Nov. 4, 1992, abandoned which is a continuation-in-part of application Ser. No. 07/676,628, filed Mar. 28, 1991 abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (20)
Number |
Date |
Country |
0087149 |
Feb 1983 |
EPX |
0172750 |
Aug 1985 |
EPX |
0198620 |
Mar 1986 |
EPX |
0369466 |
May 1990 |
EPX |
1272579 |
Aug 1960 |
FRX |
2050778 |
Jun 1969 |
FRX |
2050778 |
Mar 1971 |
FRX |
1199972 |
Sep 1965 |
DEX |
405707 |
Aug 1961 |
CHX |
831326 |
Nov 1956 |
GBX |
919261 |
Feb 1959 |
GBX |
1252603 |
May 1969 |
GBX |
1237839 |
Jun 1969 |
GBX |
1300506 |
Apr 1971 |
GBX |
1399213 |
Jun 1972 |
GBX |
1475316 |
Mar 1974 |
GBX |
1476272 |
Feb 1975 |
GBX |
2051091 |
Jan 1981 |
GBX |
2193214A |
May 1987 |
GBX |
2242431 |
Oct 1991 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Chemical Abstracts, vol. 92, 1980, p. 38, 92:95225p. |
Continuations (1)
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Number |
Date |
Country |
Parent |
971244 |
Nov 1992 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
676628 |
Mar 1991 |
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