Patent US3702320A successfully refreshed from Google Patents.
US3702320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing urethanes from cyclic nitrile carbonates and a hydroxyl-containing compound
Assignee: Atlantic Richfield Co
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Filing: 1970-05-12
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Granted: 1972-11-07
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Expires: 1990-05-12
Abstract
Abstract URETHANES ARE PREPARED BY CONDENSING-REARRANGING A HYDROXYL GROUP-CONTAINING COMPOUND WITH A CYCLIC NITRILE CARBONATE IN THE PRESENCE OF A CATALYTICLLY-EFFECTIVE AMOUNT OF DISSOLVED TIN, TITANIUM, ZINC, BISMUTH, ALUMINUM OR IRON COMPOUND IN WHICH THE METAL IS IN A VALENCE STATE OTHER THEN ZERO. USING, FOR INSTANCE, PROPANOL AND ETHANE NITRILE CARBONATE AS ILLUSTRATIVE REACTANTS, THE URETHANE-FORMING CONDENSATION-REARRANGEMENT REACTION CAN BE REPRESENTED AS FOLLOWS: CH3-CH2-CH2-OH + (2-(O=),4-(CH3-CH2-)-1,3,4-DIOXAZOLE ---> CH3-CH2-CH2-OOC-NH-CH2-CH3 + CO
Inventors
- 👤 William H Fritok
- 👤 Larry G Wolgemuth
- 👤 Robert C Strand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:51
CPC Classifications
C; C08; C08G; C08G71/00; C08G71/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |