US3737391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethers and polyurethanes
Assignee: Zeneca Inc
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Filing: 1971-02-25
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Granted: 1973-06-05
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Expires: 1991-02-25
Abstract
Abstract POLYURETHANES HAVING PROPERTIES ARE PREPARED BY REACTING POLYOXYALKYLENE ETHER DIOLS CONTAINING A CARBOXYCYCLIC OR OXACYCLIC RING AND FROM 2 TO 10 OXYALKYLENE GROUPS, POLYOXYALKYLENE ETHER POLYOLS CONTAINING FROM 5 TO 10 HYDROXYL GROUPS AND FROM 15 TO 90 OXYALKYLENE GROUPS, AND ORGANIC POLYISOCYANATES.
Inventors
- 👤 J Feltzin
- 👤 N Tehrani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4812; C08G18/487
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |