Patent US3137706A successfully refreshed from Google Patents.
US3137706A
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US
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Preparation of cyclic aromatic carbonates
Assignee: General Electric Co
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Filing: 1962-04-04
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Granted: 1964-06-16
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Expires: 1982-04-04
Abstract
No abstract record available.
Inventors
- 👤 Robert J Prochaska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:56
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/04; C08J11/10; C08J11/12; C07; C07C; C07C315/00; C07C315/04; C07D; C07D321/00; C07D321/02; C07D321/10; C07D321/12; C07D323/00; C07D327/00; C07D327/10; C08G; C08G64/00; C08G64/04; C08G64/06; C08G64/20; C08G64/30; C08J2369/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A PROCESS FOR PREPARING AN AROMATIC CYCLIC CARBONATE MONOMER WHICH PROCESS COMPRISES HEATING, UNDER BACUUM, A CARBONATE POLYMER COMPRISING RECURRING STRUCTURAL UNITS OF THE FORMULA
Claim 2
Dependent Claim
25 words
A PROCESS FOR PREPARING AN AROMATIC CYCLIC CARBONATE MONOMER WHICH PROCESS COMPRISES HEATING, UNDER BACUUM, A CARBONATE POLYMER COMPRISING RECURRING STRUCTURAL UNITS OF THE FORMULA
References Cited (Backward Citations)
US2020298A
Cited
US3072613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |