US2935494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple cyclic carbonate polymers from erythritol dicarbonate
Assignee: Union Carbide Corp
•
Filing: 1957-08-20
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Granted: 1960-05-03
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Expires: 1977-08-20
Abstract
No abstract record available.
Inventors
- 👤 Jr John M Whelan
- 👤 Jr William P Samuels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:18
CPC Classifications
C; C08; C08G; C08G71/00; C08G71/04; C08L; C08L75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A RESINOUS POLYURETHANE PRODUCT PREPARED BY THE REACTION OF ERYTHRITOL DICARBONATE HAVING THE FORMULA
Claim 2
Dependent Claim
14 words
A RESINOUS POLYURETHANE PRODUCT PREPARED BY THE REACTION OF ERYTHRITOL DICARBONATE HAVING THE FORMULA
References Cited (Backward Citations)
US2802022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |