US3901936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of n-carbamoyloxyphenyl carbamates
Assignee: Bayer Pharma AG
•
Filing: 1973-03-12
•
Granted: 1975-08-26
•
Expires: 1993-03-12
Abstract
Abstract The specification discloses the production of herbicidal Ncarbamoyloxyphenyl carbamic acid esters and a process for the production thereof in which an N-hydroxyphenyl carbamate is added to a reaction mixture comprising phosgene and an amine.
Inventors
- 👤 Gerhard Boroschewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:39
CPC Classifications
A; A01; A01N; A01N47/00; A01N47/08; A01N47/10; A01N47/22; C; C07; C07C; C07C271/00; C07C271/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
9 words
A PROCESS FOR PREPARING N-CARBAMOYLOXPHENYL CARBAMATES OF THE FORMULA
Claim 2
Dependent Claim
9 words
A PROCESS FOR PREPARING N-CARBAMOYLOXPHENYL CARBAMATES OF THE FORMULA
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the organic solvent is selected from the group consisting of dioxane, acetic ester and acetonitrile.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |