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US3388098A
Expired / Lapsed
US
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Polymers of bisphenols of spirobi
Assignee: Union Carbide Corp
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Filing: 1967-02-20
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Granted: 1968-06-11
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Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Harding James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:07
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/26; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08L; C08L75/00
Claims Analysis
Total Claims: 0
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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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |