Patent US3301824A successfully refreshed from Google Patents.
US3301824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers of cyclic carbonates
Assignee: Union Carbide Corp
•
Filing: 1963-09-26
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Granted: 1967-01-31
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Expires: 1983-09-26
Abstract
No abstract record available.
Inventors
- 👤 Hostettler Fritz
- 👤 Eugene F Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:39
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; C08G64/00; C08G64/20; C08G64/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A SOLID COPOLYMER WHICH CONTAINS FROM ABOUT 50 TO 95 MOL PERCENT OF THE RECURRING UNIT:
Claim 2
Dependent Claim
16 words
A SOLID COPOLYMER WHICH CONTAINS FROM ABOUT 50 TO 95 MOL PERCENT OF THE RECURRING UNIT:
References Cited (Backward Citations)
US2210817A
Cited
US2517965A
Cited
US2789968A
Cited
US3046255A
Cited
US3030331A
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US3169121A
Cited
US3021310A
Cited
US3063968A
Cited
FR1306250A
Cited
US3157622A
Cited
US3155683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |