Patent US2857430A successfully refreshed from Google Patents.
US2857430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ureas
Assignee: Monsanto Chemicals Ltd
•
Filing: 1956-12-31
•
Granted: 1958-10-21
•
Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 Applegath Fred
- 👤 Marioa D Barnes
- 👤 Raymond A Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:39
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/20; C07D295/215; C07C; C07C273/00; C07C273/02; C07C273/18; C07C273/1809; C07D277/00; C07D277/02; C07D277/20; C07D277/32; C07D277/38; C07D277/44; C07D277/48; C07D277/60; C07D277/84; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR PREPARING UREAS WHICH COMPRISES REACTING BY MIXING AT AN ELEVATED TEMPERATURE CARBON MONOXIDE, SULFUR AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA, MONO-PRIMARY-AMINES AND MIXTURES OF EITHER WITH SECONDARY AMINES WHEREIN NO MORE THAN ONE OF THE SUBSTITUENTS ATTACHED TO THE SECONDARY NITROGEN ATOM IS ATTACHED THERETO THROUGH AN AROMATIC CARBON ATOM.
Claim 2
Dependent Claim
57 words
A PROCESS FOR PREPARING UREAS WHICH COMPRISES REACTING BY MIXING AT AN ELEVATED TEMPERATURE CARBON MONOXIDE, SULFUR AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA, MONO-PRIMARY-AMINES AND MIXTURES OF EITHER WITH SECONDARY AMINES WHEREIN NO MORE THAN ONE OF THE SUBSTITUENTS ATTACHED TO THE SECONDARY NITROGEN ATOM IS ATTACHED THERETO THROUGH AN AROMATIC CARBON ATOM.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |