Patent US4636582A successfully refreshed from Google Patents.
Patent US3920693A successfully refreshed from Google Patents.
US3920693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of 3-aminopyrazoles
Assignee: BASF SE
•
Filing: 1974-12-16
•
Granted: 1975-11-18
•
Expires: 1994-12-16
Abstract
Abstract Production of 3-aminopyrazoles by the reaction of a hydrazine with a 2,3-halosubstituted propionitrile or a 2-halosubstituted acrylonitrile. The process is particularly useful for the production of 3-aminopyrazole. The 3-aminopyrazoles are valuable diazo components, for example for the manufacture of basic dyes.
Inventors
- 👤 Guenter Ege
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:30
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A PROCESS FOR THE PRODUCTION OF A 3-AMINOPYRAZOLE OF THE FORMULA:
Claim 2
Dependent Claim
11 words
A PROCESS FOR THE PRODUCTION OF A 3-AMINOPYRAZOLE OF THE FORMULA:
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |