Patent US3380965A successfully refreshed from Google Patents.
US3380965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing acetylenically unsaturated polycarbonates
Assignee: Union Carbide Corp
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Filing: 1964-02-10
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Granted: 1968-04-30
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Expires: 1984-02-10
Abstract
No abstract record available.
Inventors
- 👤 Matzner Markus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:13
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/26; C08G64/28; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G64/16; C08G64/1691; C08G64/18; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
IN THE PROCESS OF PREPARING AN ESSENTIALLY LINEAR, NORMALLY SOLID, ACETYLENICALLY UNSATURATED POLYCARBONATE CONSISTING ESSENTIALLY OF THE REPEATING UNIT HAVING THE STRUCTURE
Claim 2
Dependent Claim
22 words
IN THE PROCESS OF PREPARING AN ESSENTIALLY LINEAR, NORMALLY SOLID, ACETYLENICALLY UNSATURATED POLYCARBONATE CONSISTING ESSENTIALLY OF THE REPEATING UNIT HAVING THE STRUCTURE
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |