Patent US5773098A successfully refreshed from Google Patents.
US5773098A
Expired / Lapsed
US
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Applying a fluoropolymer film to a body
Assignee: BTG International Ltd
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Filing: 1995-11-21
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Granted: 1998-06-30
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Expires: 2015-11-21
Abstract
Abstract A thin fluoropolymer film is covalently bonded to a microporous ptfe film to make a bilayer for separation, filtration or reverse osmosis, by exposing the microporous film to perfluorocyclohexane under plasma. The perfluorocyclohexane molecules undergo scission and the fragments combine on the substrate to make a fluoropolymer film wherein the pores of the substrate have not been completely closed by the coating.
Inventors
- 👤 Thomas Ronald Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:10
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/127; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D71/36; B05; B05D; B05D1/00; B05D1/62; B05D3/00; B05D3/14; B05D3/141; B05D3/142; B05D3/144; D; D06; D06M; D06M10/00; D06M10/02; D06M10/025; D06M10/04; D06M10/08; D06M10/10; D06M14/00; D06M14/18; D06M14/26; D06M14/30; D06M14/34; D06M15/00; D06M15/19; D06M15/21; D06M15/244; D06M15/256; D21; D21H; D21H21/00; D21H21/14; D21H21/16; D21H23/00; D21H23/02; D21H23/22; D21H23/32; D21H23/42; D21H23/44; D21H25/00; D21H25/04; D21H25/06; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; D06M2101/00; D06M2101/16; D06M2101/18; D06M2101/22; D06M2400/00; D06M2400/01; D21H17/00; D21H17/03; D21H17/05; D21H17/11
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
82 words
A method of applying a fluoropolymer film to a porous or microporous body, comprising exposing the body to a supply of saturated molecules of the formula C n F 2n , where n=4-8, causing scission of the molecules, and allowing the fragments to combine on the surface of the body to form an adherent fluoropolymer layer, and ceasing exposure of the body to the supply of saturated molecules before the pores of the body have been completely closed by the deposited fluoropolymer.
Claim 2
Independent Claim
82 words
A method of applying a fluoropolymer film to a porous or microporous body, comprising exposing the body to a supply of saturated molecules of the formula C n F 2n , where n=4-8, causing scission of the molecules, and allowing the fragments to combine on the surface of the body to form an adherent fluoropolymer layer, and ceasing exposure of the body to the supply of saturated molecules before the pores of the body have been completely closed by the deposited fluoropolymer.
Claim 3
Dependent Claim
39 words
A method of applying a fluoropolymer film according to claim 1 wherein the porous body is a carbonaceous polymer, and the fragments combine on the surface of the body to form a fluoropolymer layer covalently bonded to the body.
Claim 4
Dependent Claim
13 words
A method according to claim 1, wherein the carbonaceous polymer is a fluoropolymer.
Claim 5
Dependent Claim
13 words
A method according to claim 1, wherein the body is itself a film.
Claim 6
Dependent Claim
13 words
A method according to claim 4, wherein the body is a microporous film.
Claim 7
Dependent Claim
12 words
A method according to claim 1, wherein the molecules are of cycloperfluoroalkane.
Claim 8
Dependent Claim
21 words
A method according to claim 6, wherein the molecules are of cyclo-C n F 2n where n=4, 5, 7 or 8.
Claim 9
Dependent Claim
12 words
A method according to claim 6, wherein the molecules are of cycloperfluorohexane.
Claim 10
Dependent Claim
19 words
A method according to claim 1, wherein the porous body is etched before the application of said film thereto.
Claim 11
Dependent Claim
17 words
A method according to claim 1, wherein the body is subjected to plasma irradiation during its exposure.
Claim 12
Dependent Claim
15 words
A method according to claim 10, wherein the plasma power is less than 100 W.
Claim 13
Dependent Claim
16 words
A method according to claim 11, wherein the plasma power is from 0.1 to 50 W.
Claim 14
Dependent Claim
17 words
A method according to claim 11 or 12, wherein the plasma power is less than 5 W.
Claim 15
Dependent Claim
16 words
A method according to claim 1, performed in a chamber evacuated to 0.01 to 5 torr.
Claim 16
Dependent Claim
16 words
A method according to claim 9, wherein the etching is performed by a noble gas plasma.
References Cited (Backward Citations)
US3700489A
Cited
US4052754A
Cited
US4391843A
Cited
US4479982A
Cited
US4729906A
Cited
JPS6099326A
Cited
JPS6197008A
Cited
US4718907A
Cited
US5091204A
Cited
US4791012A
Cited
US4869922A
Cited
JPS62204826A
Cited
EP0247771A1
Cited
US5087776A
Cited
US5045357A
Cited
US4906240A
Cited
WO1990013593A1
Cited
US5041304A
Cited
US5425865A
Cited
US5411769A
Cited
US5244730A
Cited
US5246451A
Cited
US5437900A
Cited
WO1993000394A1
Cited
US5516561A
Cited
US5192580A
Cited
US5387378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-29 | 2001-12-29 | 2002-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-29 | 2005-12-29 | 2006-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-29 | 2009-12-29 | 2010-06-30 | $7700.00 | Window Closed / Lapsed |