US3702839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing 2-oxazolidone polymers
Assignee: Monsanto Research Corp
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Filing: 1969-07-25
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Granted: 1972-11-14
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Expires: 1989-07-25
Abstract
Abstract 2-OXAZOLIDONE POLYMERS ARE PREPARED FROM DIISOCYANATES AND DIEPOXIDES BY HEATING AT 25-250*C. IN THE PRESENCE OF A PHOSPHONIUM SALT.
Inventors
- 👤 David Gerald Glasgow
- 👤 Archie E Follett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:36
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/166; C08G18/168; C08G18/003; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4028; C08G73/00; C08G73/06; Y; Y10; Y10S; Y10S528/00; Y10S528/903
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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |