Patent US2677698A successfully refreshed from Google Patents.
US2677698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nu-monosubstituted carbamic acid esters
Assignee: Spencer Chemical Co
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Filing: 1950-08-01
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Granted: 1954-05-04
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Expires: 1970-08-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Archie John Deutschman
- 👤 Bull Willard Clare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:46
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A PROCESS FOR THE PRODUCTION OF N-MONOSUBSTITUTED CARBAMIC ACID ESTERS WHICH COMPRISES, REACTING A PRIMARY AMINE WITH UREA ATA REACTION TEMPERATURE IN THE ORDER OF 100* C. TO 250* C. AND IN A MOLE RATIO SUBSTANTIALLY IN EXCESS OF TWO MOLES OF AMINE PER MOLE OF UREA, THEREAFTER SEPARATING SUBSTANTIALLY ALL OF THE UNREACTED AMINE AND THE GENERAL AMMONIA FROM SAID REACTION MIXTURE LEAVING SUBSTANTIALLY 1,3-DISUBSTITUTED UREA, PRODUCING A SECOND REACTION MIXTURE BY REACTIN THE 1-3-DISUBSTITUTED UREA WITH A MONOHYDROXY ALCOHOL AT A REACTION TEMPERATURE IN THE ORDER OF 100* C. TO 200* C. AND IN A MOLE RATIO SUBSTANTIALLY IN EXCESS OF ONE MOLE OF ALCOHOL PER MOLE OF 1,3-DISUBSTITUTED AREA, AND THEREAFTER SEPARATING THE RESULTANT N-MONOSUBSTITUTED CARBAMIC ACID ESTER FROM SAID SECOND REACTION MIXTURE.
Claim 2
Dependent Claim
126 words
A PROCESS FOR THE PRODUCTION OF N-MONOSUBSTITUTED CARBAMIC ACID ESTERS WHICH COMPRISES, REACTING A PRIMARY AMINE WITH UREA ATA REACTION TEMPERATURE IN THE ORDER OF 100* C. TO 250* C. AND IN A MOLE RATIO SUBSTANTIALLY IN EXCESS OF TWO MOLES OF AMINE PER MOLE OF UREA, THEREAFTER SEPARATING SUBSTANTIALLY ALL OF THE UNREACTED AMINE AND THE GENERAL AMMONIA FROM SAID REACTION MIXTURE LEAVING SUBSTANTIALLY 1,3-DISUBSTITUTED UREA, PRODUCING A SECOND REACTION MIXTURE BY REACTIN THE 1-3-DISUBSTITUTED UREA WITH A MONOHYDROXY ALCOHOL AT A REACTION TEMPERATURE IN THE ORDER OF 100* C. TO 200* C. AND IN A MOLE RATIO SUBSTANTIALLY IN EXCESS OF ONE MOLE OF ALCOHOL PER MOLE OF 1,3-DISUBSTITUTED AREA, AND THEREAFTER SEPARATING THE RESULTANT N-MONOSUBSTITUTED CARBAMIC ACID ESTER FROM SAID SECOND REACTION MIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |