Patent US3632387A successfully refreshed from Google Patents.
US3632387A
Expired / Lapsed
US
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Porous teflon having grafted polymer layers on the walls of the pores and on other surfaces
Assignee: Wyeth Holdings LLC
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Filing: 1969-01-30
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Granted: 1972-01-04
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Expires: 1989-01-30
Abstract
Abstract An improved polyhalogenated ethylene product which may have a grafted polymer on its surface, and a process for lining the internal pores of the polyhalogenated ethylene product is given whereby the polyhalogenated ethylene product is pretreated with a surface active agent, followed by etching which renders the surface and internal pores receptive to grafting. This base may then be impregnated with a monomer and subjected to grafting reactions which form the improved polyhalogenated product which may be used as a membrane, nonreactive tubing or cannula and the like.
Inventors
- 👤 Judith E Sutherland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; C08J2327/00; C08J2327/02; C08J2433/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
The process according to claim 1 wherein the surface active agent is 1,4-bis(2-ethylhexyl) sodium sulfosuccinate.
Claim 2
Dependent Claim
14 words
The process according to claim 1 wherein the surface active agent is n-dioctylsodium sulfosuccinate.
Claim 3
Dependent Claim
13 words
The process according to claim 1 wherein the surface active agent is octylphenoxypolyethoxyethanol.
Claim 4
Dependent Claim
14 words
The process according to claim 1 wherein the surface active agent is sodium dihexylsulfosuccinate.
Claim 5
Dependent Claim
16 words
The process according to claim 1 wherein the surface active agent is stearamido-propyl-dimethyl- Beta -hydroxyethyl-ammonium phosphate.
Claim 6
Dependent Claim
13 words
The process according to claim 1 wherein the polyhalogenated ethylene base is polytetrafluoroethylene.
Claim 7
Dependent Claim
12 words
The process according to claim 7 wherein the polymerizable monomer is methylmethacrylate.
Claim 8
Dependent Claim
13 words
The process according to claim 7 wherein the polymerizable monomer is acrylic acid.
Claim 9
Dependent Claim
14 words
The process according to claim 7 wherein the surface active agent is n-dioctylsodium sulfosuccinate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |