Patent US3057910A successfully refreshed from Google Patents.
US3057910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of n-alkyl-o-aryl urethanes
Assignee: Bayer AG
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Filing: 1959-08-19
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Granted: 1962-10-09
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Expires: 1979-08-19
Abstract
No abstract record available.
Inventors
- 👤 Fischer Peter
- 👤 Pfirschke Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:22
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
31 words
A PROCESS FOR THE PRODUCTION OF N-METHYL-O-O-ISOPROPYL PHENYL URETHANE WHICH COMPRISES SIMULTANEOUSLY REACTING TOGHETHER PHOSGENE AND METHYL AMINE WITH O-ISOPROPYL PHENOL IN AN INERT ORGANIC SOLVENT AT A TEMPERATURE OF 80*-180*C.
References Cited (Backward Citations)
US2854374A
Cited
US2903478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |