US3143530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear polycarbonamides from piperazines and fluorene dicarboxylic acids
Assignee: Union Carbide Corp
•
Filing: 1961-04-19
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Granted: 1964-08-04
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Expires: 1981-04-19
Abstract
No abstract record available.
Inventors
- 👤 Onofrio Anthony A D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:20
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
LINEAR, AMORPHOUS THERMOPLASTIC POLYCARBONAMIDES HAVING A PLURALITY OF RECURRING STRUCTURAL UNITS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
15 words
LINEAR, AMORPHOUS THERMOPLASTIC POLYCARBONAMIDES HAVING A PLURALITY OF RECURRING STRUCTURAL UNITS OF THE GENERAL FORMULA:
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |