US2655534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of n-aromatic-n'-aliphatic hydrocarbon ureas
Assignee: EIDP Inc
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Filing: 1951-10-25
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Granted: 1953-10-13
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Expires: 1971-10-25
Abstract
No abstract record available.
Inventors
- 👤 Norman E Searle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:13
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1809
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR PREPARING AN N-AROMATIC-N''ALIPHATIC HYDROCARBON UREA WHICH COMPRISES HEATING AND REACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND AT A TEMPERATURE ABOVE 50* C. AN ALIPHATIC HYDROCARBON AMINE SALT OF AN N-ALIPHATIC HYDROCARBON MONOTHIOCARBAMIC ACID WITH A CARBOCYCLIC AROMATIC AMINE OF 1 TO 2 SIX-MEMBERED NUCLEI HAVING HYDROGEN ON THE AMINO NITROGEN AND HAVING THE AMINO GROUP ATTACHED DIRECTLY TO NUCLEAR CARBON, AND ISOLATING THE RESULTING N-AROMATIC-N''-ALIPHATIC NYDROCARBON UREA.
Claim 2
Dependent Claim
69 words
A PROCESS FOR PREPARING AN N-AROMATIC-N''ALIPHATIC HYDROCARBON UREA WHICH COMPRISES HEATING AND REACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AND AT A TEMPERATURE ABOVE 50* C. AN ALIPHATIC HYDROCARBON AMINE SALT OF AN N-ALIPHATIC HYDROCARBON MONOTHIOCARBAMIC ACID WITH A CARBOCYCLIC AROMATIC AMINE OF 1 TO 2 SIX-MEMBERED NUCLEI HAVING HYDROGEN ON THE AMINO NITROGEN AND HAVING THE AMINO GROUP ATTACHED DIRECTLY TO NUCLEAR CARBON, AND ISOLATING THE RESULTING N-AROMATIC-N''-ALIPHATIC NYDROCARBON UREA.
References Cited (Backward Citations)
US2226835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-12 | 1957-04-13 | 1957-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-12 | 1961-04-13 | 1961-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-12 | 1965-04-13 | 1965-10-13 | $7700.00 | Window Closed / Lapsed |