US2953570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making hydrazine derivatives
Assignee: WR Grace and Co
•
Filing: 1957-06-13
•
Granted: 1960-09-20
•
Expires: 1977-06-13
Abstract
No abstract record available.
Inventors
- 👤 Rudner Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:12
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/22; C07D295/28; C07D295/30; C07D211/00; C07D211/92; C07D211/98; C07D303/00; C07D303/02; C07D303/38; C07D303/40; C07D303/42; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4035; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/19; Y10S260/20; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A PROCESS FOR PREPARING 1,1,1-TRISUBSTITUTED HYDRAZINIUM SALTS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
37 words
A PROCESS ACCORDING TO CLAIM 7 WHEREIN R1 IS HYDROXYLALKYL, R2, R3, AND R4 ARE HYDROGEN, R5 AND R6 TOGETHER WITH THE NITROGEN ON WHICH THEY ARE BOTH SUBSTITUENTS FORM A PIPERIDINE RING AND X IS CHLORIDE.
References Cited (Backward Citations)
US2660607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |