Patent US3681426A successfully refreshed from Google Patents.
US3681426A
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US
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Fluorinated polymers having bisurethano side chains
Assignee: Hoechst AG
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Filing: 1969-08-15
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Granted: 1972-08-01
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Expires: 1989-08-15
Abstract
Abstract Polymers of the formula IN WHICH Rf is perfluoroalkyl of six to 12 carbon atoms, n is an integer of 1 to 4, m is 0 or 1 and x is a number of about 10 to about 300, are useful as water- and oil-repellent agents for fibrous materials, especially materials consisting of or containing cotton or wool. The agents are used in aqueous dispersions or solutions in organic solvents.
Inventors
- 👤 Helmut Hahn
- 👤 Siegfried Rebsdat
- 👤 Kasimir Ruchlak
- 👤 Erich Schuierer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:35
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8083; C08G18/8087; C08G18/28; C08G18/40; C08G18/62; C08G18/6212; D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; D06M15/576
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
18 words
The polymer as claimed in claim 1, wherein Rf stands for perfluoro-n-alkyl of six to 12 carbon atoms.
References Cited (Backward Citations)
US3428614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |