US3069385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chain extending polycarbonate
Assignee: —
•
Filing: —
•
Granted: 1962-12-18
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Expires: 1979-12-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:23
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/18; C08G64/183; C07; C07C; C07C69/00; C07C69/96; C08G63/00; C08G63/64; C08G64/04; C08G64/06; C08G64/08; C08G64/14; C08G64/20; C08G64/22; C08G64/24; C08G64/30; C08G64/307
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
THE METHOD WHICH COMPRISES CHAIN EXTENDING A PHENOLIC HYDROXYL CONTAINING POLYCARBONATE PROVIDED BY REACTION OF AROMATIC DIOL HAVING A PAIR OF PHENOLIC HYDROXYL GROUPS WITH BISHALOFORMATE OF ALIPHATIC DIOL BY REACTING THE POLYCARBONATE WITH PHOSGENE AND BASE.
Claim 2
Independent Claim
37 words
THE METHOD WHICH COMPRISES CHAIN EXTENDING A PHENOLIC HYDROXYL CONTAINING POLYCARBONATE PROVIDED BY REACTION OF AROMATIC DIOL HAVING A PAIR OF PHENOLIC HYDROXYL GROUPS WITH BISHALOFORMATE OF ALIPHATIC DIOL BY REACTING THE POLYCARBONATE WITH PHOSGENE AND BASE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |