US5773098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Applying a fluoropolymer film to a body
Assignee: BTG International Ltd
•
Filing: 1995-11-21
•
Granted: 1998-06-30
•
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 12:14
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.
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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 |