US3387058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fusible and infusible polymers from carbocyclic aromatic polycarboxylic phenyl esters and carbocyclic aromatic tetramines
Assignee: Whittaker Corp
•
Filing: 1963-12-23
•
Granted: 1968-06-04
•
Expires: 1983-12-23
Abstract
No abstract record available.
Inventors
- 👤 Harold H Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:25
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/18; Y; Y10; Y10S; Y10S525/00; Y10S525/928
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
THE PROCESS COMPRISING REACTING AT LEAST ONE DIPHENYL ESTER OF A CARBOXYLIC AROMATIC ACID WITH A CARBOCYCLIC AROMATIC TETRAMINE AT A TEMPERATURAE FROM ABOUT 150*C. TO ABOUT 400*C. TO PRODUCE A FUSIBLE LINEAR POLYBENZIMIDAZOL, REACTING A CARBOCYLIC AROMATIC POLYCARBOXYLIC PHENYL ESTER HAVING AN ESTER FUNCTIONALITY GREATER THAN 2 WITH A CARBOCYCLIC AROMATIC TETRMINE AT A TEMPERATURE OF FROM ABOUT 150*C. TO ABOUT 400*C. TO PRODUCE A SECOND POLYBENZIMIDAZOLE, AND MIXING SAID LINEAR POLYBENZIMIDAZOLE AND SAID SECOND POLYBENZIMIDAZOLE.
References Cited (Backward Citations)
US2341611A
Cited
US2374354A
Cited
US2502548A
Cited
US2895948A
Cited
US3179634A
Cited
US3174947A
Cited
US3260691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |