Patent US3072613A successfully refreshed from Google Patents.
US3072613A
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Multiple cyclic carbonate polymers
Assignee: Union Carbide Corp
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Filing: 1957-08-20
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Granted: 1963-01-08
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Expires: 1977-08-20
Abstract
No abstract record available.
Inventors
- 👤 Jr John M Whelan
- 👤 Robert J Cotter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/8064; C08G71/00; C08G71/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A RESINOUS POLYURETHANE PRODUCT PREPARED BY THE REACTION AT A TEMPERATURE ABOVE ABOUT 0*C. OF A MULTIPLE CYCLIC CARBONATE HAVING THE STRUCTURE
Claim 2
Dependent Claim
22 words
A RESINOUS POLYURETHANE PRODUCT PREPARED BY THE REACTION AT A TEMPERATURE ABOVE ABOUT 0*C. OF A MULTIPLE CYCLIC CARBONATE HAVING THE STRUCTURE
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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |