US4144374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perfluorinated functionalized materials
Assignee: Massachusetts Institute of Technology
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Filing: 1977-01-03
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Granted: 1979-03-13
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Expires: 1997-01-03
Abstract
Abstract Perfluorinated functionalized materials are disclosed which are prepared by simultaneous perfluorination and functionalization. A wide variety of materials can be used including polymers and other branched or straight chain hydrocarbons. The material to be perfluorinated is placed in a direct fluorination apparatus and a mixture of fluorine and oxygen is passed over the material using La-Mar direct fluorination techniques. With materials such as polyethylene or polypropylene, pendant alkyl groups are converted to either acid fluoride groups or perfluoroalkyl groups, with the exact ratio of each being dependent upon the specific fluorine-to-oxygen ratio used.
Inventors
- 👤 Richard J. Lagow
- 👤 James L. Adcock
- 👤 Shoji Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:10
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
28 words
A conductive membrane comprising a perfluorinated polymer having pendant functional groups thereon, said pendant functional groups being selected from acid fluoride, carboxylic acid, or a mixture of both.
Claim 2
Dependent Claim
28 words
A conductive membrane comprising a perfluorinated polymer having pendant functional groups thereon, said pendant functional groups being selected from acid fluoride, carboxylic acid, or a mixture of both.
Claim 3
Dependent Claim
14 words
A conductive membrane of claim 1 having a resistivity of below about 150 ohm-cm.
Claim 4
Dependent Claim
13 words
A conductive membrane of claim 2 wherein said perfluorinated polymer comprises a polyolefin.
Claim 5
Dependent Claim
11 words
A conductive membrane of claim 3 wherein said polyolefin is polyethylene.
Claim 6
Dependent Claim
11 words
A conductive membrane of claim 3 wherein said polyolefin is polypropylene.
Claim 7
Dependent Claim
16 words
A conductive membrane of claim 3 wherein said polyolefin is a copolymer of ethylene and propylene.
Claim 8
Dependent Claim
18 words
A conductive membrane of claim 3 having a thickness of from about one mil to about 25 mils.
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) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |