Patent US3779990A successfully refreshed from Google Patents.
US3779990A
Expired / Lapsed
US
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Process for the production of shapeable polymers containing coo-silyl groups
Assignee: Novartis Corp
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Filing: 1972-02-14
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Granted: 1973-12-18
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Expires: 1992-02-14
Abstract
Abstract THE INVENTION RELATES TO A PROCESS FOR THE PRODUCTION OF SHAPEABLE POLYMERS CONTAINING COO-SILYL GROUPS, ESPECIALLY POLYAMIDE-IMIDES AND POLYIMIDES CONTAINING COO-SILYL GROUPS, AND PROCESS COMPRISING TREATING POLYAMIDE ACIDS WITH SUITABLE SILYLATING AGENTS, AS WELL AS THE NOVEL POLYMERS OBTAINED BY SAID PROCESS AND THEIR USE FOR THE PRODUCTION OF SHAPED STRUCTURES SUCH AS FILMS, FIBRES, COATINGS, ADHESIVES AND THE LIKE. THE POLYMERS PREPARED ACCORDING TO THE INVENTION ARE DISTINGUISHED BY AN INHERENT VISCOISTY OF FROM 0.1 TO 4.0 AND THEIR IMPROVED SOLUBILITY IN ORGANIC SOLVENTS WHICH FACILITATES THE PROCESSING OF SAID POLYMERS.
Inventors
- 👤 G Greber
- 👤 R Darms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:26
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |