Patent US3911006A successfully refreshed from Google Patents.
US3911006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of trisubstituted ureas
Assignee: Quimco GmbH
•
Filing: 1973-03-30
•
Granted: 1975-10-07
•
Expires: 1993-03-30
Abstract
Abstract The present invention provides a process for preparing a trisubstituted urea of the general formula:
Inventors
- 👤 Colin John Hearsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:39
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/38; C07D295/00; C07D295/04; C07D295/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
10 words
A PROCESS FOR PREPARING A TRISUSTITUTED UREA OF THE FORMULA:
Claim 2
Dependent Claim
10 words
A PROCESS FOR PREPARING A TRISUSTITUTED UREA OF THE FORMULA:
Claim 3
Dependent Claim
16 words
A process according to claim 1 in which the reaction is performed in an inert solvent.
Claim 4
Dependent Claim
21 words
A process according to claim 1 in which the reaction is performed at a temperature within the range 80* - 200*C.
References Cited (Backward Citations)
US2683696A
Cited
US3119682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |