US3658857A
Expired / Lapsed
US
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Perfluoroalkylamido-alkyl and alkylthio esters of fumaric acid and other ethylenically unsaturated polybasic acids and polymers thereof
Assignee: Novartis Corp
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Filing: 1968-05-27
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Granted: 1972-04-25
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Expires: 1988-05-27
Abstract
Abstract MONOMERIC PERFLUOROALKYLAMIDO-ALKYL AND ALKYLTHIO ESTERS OF FUMARIC, MALEIC, CITRACONIC, MESACONIC, ITACONIC, ACONITIC, AND METHYLENE MALONIC ACID FORM HOMOPOLYMERS AND FORM COPOLYMERS WITH OHTER ETHYLENICALLY UNSATURATED COMONOMERS. THE POLYMERS OBTAINED HAVE VALUABLE SOIL REPELLENT PROPERTIES AND ARE THEREFORE ESPECIALLY USEFUL IN TEXTILE FINISHES. A PREFERRED COMPOUND EXEMPLIFIED IS BIS(2(N-PERFLUOROOCTANOAMIDO)ETHYL)THIOFUMARATE.
Inventors
- 👤 Eduard Karl Kleiner
- 👤 Martin Knell
- 👤 Pier Luigi Pacini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:22
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/285; D06M15/295; C; C08; C08F; C08F22/00; C08F22/10; C08F22/12; C08F22/22; C08F28/00; D06M15/263; D06M15/277
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |