Patent US4552164A successfully refreshed from Google Patents.
Patent US3598767A successfully refreshed from Google Patents.
US3598767A
Expired / Lapsed
US
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Silicon-containing benzimidazole polymer and method of making same
Assignee: United States Department of the Navy
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Filing: 1969-01-27
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Granted: 1971-08-10
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Expires: 1989-01-27
Abstract
Abstract AN AROMATIC SILICON-CONTAINING BENZIMIDAZOLE POLYMER IS PREPARED FROM BIS(P-CARBOEPENTACHLOROPENOXYPHENYL) DIPHENYLSILANE OBTAINED BY OXIDIZING DIPHENYLDI(P-TOLYL) SILANE TO A DICARBOXYLIC ACID AND ESTERIFYING THE LATTER. THE NEW SILICON-CONTAINING BENZIMIDAZOLE POLYMER IS SOLUBLE INORGANIC SOLVENTS, STABLE AT TEMPERATURES RANGING UP TO SEVERAL HUNDRED DEGREES CENTIGRADE, HAS ELECTRICAL INSULATING PROPERTIES , IS MOLDABLE INTO A SHAPED SOLID, FILAMENT, SHEET FILM, OR FILM COATING HAVING GOOD ADHESION TO SMOOTH SURFACES.
Inventors
- 👤 Hanna N Kovacs
- 👤 Alvin D Delman
- 👤 Bernard B Simms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:58
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/18; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0803; C07F7/081; C07F7/0812
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |