US3639503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolycarbonates containing polylactone blocks and cyclobutylene polycarbonate blocks
Assignee: Union Carbide Corp
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Filing: 1969-02-20
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Granted: 1972-02-01
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Expires: 1989-02-20
Abstract
Abstract THIS INVENTION RELATES TO IMPROVED BLOCK COPOLYCARBONATES CONTAINING AN AMORPHOUS, SOFT, RUBBERY SEGMENT OR BLOCK COMPOSED OF LACTONE UNITES AND ANOTHER CRYSTALLINE, HARD THRMOPLASTIC SEGMENT OF BLOCK COMPOSED OF CYCLOBUTYLENE POLYCARBONATE.
Inventors
- 👤 Markus Matzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:29
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08G63/64
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |