US2876260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of symmetrical disubstituted ureas
Assignee: Dow Chemical Co
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Filing: 1956-08-27
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Granted: 1959-03-03
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Expires: 1976-08-27
Abstract
No abstract record available.
Inventors
- 👤 Earl S Huyser
- 👤 William F Tousignant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C07C273/1836
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A PROCESS FOR PRODUCING A SYMMETRICAL DISUBSTITUTED UREA HAVING THE FORMULA R-NHCONH-R, WHEREIN R IS A HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL, CYCLOALKY, ARALKYL AND PHENYL, COMPRISING HEATING AT ABOUT 120* C. A MIXTURE OF A PRIMARY AMINE HAVING THE FORMULA RNH2, WHEREIN R HAS THE SAME SIGNIFICANCE AS ABOVE, AND AT LEAST ABOUT TWO MOLAR EQUIVALENTS OF A 2-AMINOETHYL CARBAMATE HAVING THE FORMULA
Claim 2
Dependent Claim
68 words
A PROCESS FOR PRODUCING A SYMMETRICAL DISUBSTITUTED UREA HAVING THE FORMULA R-NHCONH-R, WHEREIN R IS A HYDROCARBON RADICAL SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL, CYCLOALKY, ARALKYL AND PHENYL, COMPRISING HEATING AT ABOUT 120* C. A MIXTURE OF A PRIMARY AMINE HAVING THE FORMULA RNH2, WHEREIN R HAS THE SAME SIGNIFICANCE AS ABOVE, AND AT LEAST ABOUT TWO MOLAR EQUIVALENTS OF A 2-AMINOETHYL CARBAMATE HAVING THE FORMULA
References Cited (Backward Citations)
US2172747A
Cited
DE937586C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |