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Patent US3876589A successfully refreshed from Google Patents.
US3876589A
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Highly fluorinated derivatives of copolymers of fluoroalkyl ethers and maleic anhydride
Assignee: United States Department of Agriculture
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Filing: 1973-07-19
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Granted: 1975-04-08
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Expires: 1993-07-19
Abstract
Abstract Copolymers of fluoroalkyl allyl (or methallyl) ethers and maleic anhydride are modified by conversion of anhydride units into acid fluoride groups of fluoroalkyl ester groups. These modified copolymers are useful for many purposes, including application to fibrous materials, e.g., textiles, to enhance their oil- and water-repellency.
Inventors
- 👤 William L Wasley
- 👤 Allen G Pittman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:25
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/347; D06M15/353; C; C08; C08F; C08F16/00; C08F16/12; C08F16/14; C08F16/28; C08F222/00; C08F222/04; C08F222/06; C08F8/00; D06M15/263; D06M15/267; D06M15/285; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891; Y10T428/31895; Y10T428/31909; Y10T442/00; Y10T442/20; Y10T442/2279; Y10T442/2287
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
18 words
AN ADDITION COPOLYMER HAVING SOIL REPELLENT AND SOIL RELEASE PROPERTIES WHICH CONTAINS A. RECURRING UNITS OF THE STRUCTURE
Claim 2
Dependent Claim
18 words
AN ADDITION COPOLYMER HAVING SOIL REPELLENT AND SOIL RELEASE PROPERTIES WHICH CONTAINS A. RECURRING UNITS OF THE STRUCTURE
Claim 3
Dependent Claim
8 words
The copolymer of claim 1 wherein R.sub.f is
Claim 4
Dependent Claim
12 words
The copolymer of claim 1 wherein R.sub.f is Cf.sub.3 --(cf.sub.2).sub.6 --ch.sub.2 --
Claim 5
Dependent Claim
18 words
an addition copolymer having soil repellent and soil release properties which contains a. recurring units of the structure
Claim 6
Dependent Claim
18 words
an addition copolymer having soil repellent and soil release properties which contains a. recurring units of the structure
Claim 7
Dependent Claim
11 words
The copolymer of claim 4 wherein R.sub.f in units a is
Claim 8
Dependent Claim
15 words
The copolymer of claim 4 wherein R.sub.f in units a is Cf.sub.3 --(cf.sub.2).sub.6 --ch.sub.2 --
Claim 9
Dependent Claim
15 words
the copolymer of claim 4 wherein R.sub.f in units b is Cf.sub.3 --(cf.sub.2).sub.6 --ch.sub.2 --
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |