Patent US3274214A successfully refreshed from Google Patents.
US3274214A
Expired / Lapsed
US
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Aromatic carbonates
Assignee: General Electric Co
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Filing: 1962-12-26
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Granted: 1966-09-20
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Expires: 1982-12-26
Abstract
No abstract record available.
Inventors
- 👤 Robert J Prochaska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:18
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/04; C08G64/06; C07; C07D; C07D323/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A CYCLIC AROMATIC CARBONATE POLYMER HAVING THE STRUCTURE
Claim 2
Dependent Claim
8 words
A CYCLIC AROMATIC CARBONATE POLYMER 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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |