Patent US3770698A successfully refreshed from Google Patents.
US3770698A
Expired / Lapsed
US
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Phenol terminated carboxy containing diene elastomers
Assignee: Individual
•
Filing: 1971-12-17
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Granted: 1973-11-06
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Expires: 1991-12-17
Abstract
Abstract PHENOL TERMINATED ELASTOMERS ARE PREPARED BY REACTING CARBOXYL TERMINATED POLYMERS LF DIENES WITH DIPHENOLS SUCH AS BISPHENOL A, SO THAT THE CARBOXYL GROUPS BECOME PART OF THE MOLECULAR CHAIN AND PHENOLIC HYDROXYLS BECOME END GROUPS. VERY SMALL PROPORTIONS OF THE PHENOL TERMINATED ELASTOMERS ADDED TO EPOXY RESIN COMPOSITIONS SUCH AS THOSE BASED ON THE DIGLYCIDYL ETHER OF BISPHENOL A PRODUCE A VERY GREAT INCREASE IN RESISTANCE TO IMPACT.
Inventors
- 👤 C Riew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:02
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/34; C08C19/36; C08L; C08L63/00; Y; Y10; Y10S; Y10S525/00; Y10S525/911
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |