Patent US2809190A successfully refreshed from Google Patents.
US2809190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing esters of n-car-bamylfumaramic acid
Assignee: Uniroyal Inc
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Filing: 1953-11-30
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Granted: 1957-10-08
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Expires: 1973-11-30
Abstract
No abstract record available.
Inventors
- 👤 Robert J Kelly
- 👤 Carl E Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:19
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1854
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
METHOD OF PREPARING ESTERS OF TRANS N-CARBAMYLAMIC ACIDS WHICH COMPISES HEATING N-CARBAMYLMALEIMIDE, AND A COMPOUND CONTAINING A NON-TERTIARY ALCOHOLIC HYDROXYL GROUP IN THE PRESENCE OF A CIS-TRANS ISOMERIZING AGENT SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE, STRONG MINERAL ACIDS, AND NON-TERTIARY AMINES.
Claim 2
Dependent Claim
43 words
METHOD OF PREPARING ESTERS OF TRANS N-CARBAMYLAMIC ACIDS WHICH COMPISES HEATING N-CARBAMYLMALEIMIDE, AND A COMPOUND CONTAINING A NON-TERTIARY ALCOHOLIC HYDROXYL GROUP IN THE PRESENCE OF A CIS-TRANS ISOMERIZING AGENT SELECTED FROM THE CLASS CONSISTING OF ALUMINUM CHLORIDE, STRONG MINERAL ACIDS, AND NON-TERTIARY AMINES.
References Cited (Backward Citations)
US2306905A
Cited
US2576895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |