Patent US2742450A successfully refreshed from Google Patents.
US2742450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogenous condensates
Assignee: Rohm and Haas Co
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Filing: 1952-07-14
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Granted: 1956-04-17
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Expires: 1972-07-14
Abstract
No abstract record available.
Inventors
- 👤 Robert S Yost
- 👤 Robert W Auten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:44
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; C08G12/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR PREPARING NITROGENOUS CONDENSATES WHICH COMPRISES PREPARING A POLYUREA BY HEATING TOGETHER WITH EVOLUTION OF AMMONIA, FOR A PERIOD OF ABOUT ONE AND THREE-QUARTERS HOURS TO ABOUT TWO AND ONE-HALF HOURS AT A TEMPERATURE RISING FROM ABOUT 90* C. AT THE BEGINNING OF THE PERIOD TO AT LEAST ABOUT 142* TO 145* C. AT THE END OF THE PERIOD, A MIXTURE OF UREA AND A POLYALKLYENEPOLYAMINE OF THE FORMULA PS@ NH2(ANH)NH
Claim 2
Dependent Claim
73 words
A PROCESS FOR PREPARING NITROGENOUS CONDENSATES WHICH COMPRISES PREPARING A POLYUREA BY HEATING TOGETHER WITH EVOLUTION OF AMMONIA, FOR A PERIOD OF ABOUT ONE AND THREE-QUARTERS HOURS TO ABOUT TWO AND ONE-HALF HOURS AT A TEMPERATURE RISING FROM ABOUT 90* C. AT THE BEGINNING OF THE PERIOD TO AT LEAST ABOUT 142* TO 145* C. AT THE END OF THE PERIOD, A MIXTURE OF UREA AND A POLYALKLYENEPOLYAMINE OF THE FORMULA PS@ NH2(ANH)NH
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) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |