US3190856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides from benzophenonetetra-carboxylic acids and a primary diamine
Assignee: Shawinigan Resins Corp
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Filing: 1961-06-27
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Granted: 1965-06-22
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Expires: 1981-06-27
Abstract
No abstract record available.
Inventors
- 👤 Lavin Edward
- 👤 Albert H Markhart
- 👤 Robert E Kass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:49
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071; C08G73/1042; C08G73/1075; C08G73/1082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A SOLUBLE, FLEXIBLE POLYAMIDE RESIN THAT IS THE POLYMERIC CONDENSATION PRODUCT OF AN AROMATIC PRIMARY DIAMINE CONTAINING FROM 6 TO 16 CARBON ATOMS WITH THE DIANHYDRIDE OF AN ACID SELECTED FROM THE GROUP CONSISTING OF 2,2'',3,3''-, 2,3,3'',4''-, 3,3'',4,4''-BENZOPHENONETETRACARBOXYLIC ACIDS AND MIXTURES THEREOF.
Claim 2
Dependent Claim
42 words
A SOLUBLE, FLEXIBLE POLYAMIDE RESIN THAT IS THE POLYMERIC CONDENSATION PRODUCT OF AN AROMATIC PRIMARY DIAMINE CONTAINING FROM 6 TO 16 CARBON ATOMS WITH THE DIANHYDRIDE OF AN ACID SELECTED FROM THE GROUP CONSISTING OF 2,2'',3,3''-, 2,3,3'',4''-, 3,3'',4,4''-BENZOPHENONETETRACARBOXYLIC ACIDS AND MIXTURES THEREOF.
References Cited (Backward Citations)
US2279752A
Cited
US2862836A
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US2941901A
Cited
US3073785A
Cited
US3075942A
Cited
US3037966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |