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Patent US2838513A successfully refreshed from Google Patents.
US2838513A
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Method for the preparation of 3:6-dihydrazino-pyridazine
Assignee: CIBA PHARM PROD Inc
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Filing: 1953-08-13
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Granted: 1958-06-10
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Expires: 1973-08-13
Abstract
No abstract record available.
Inventors
- 👤 Druey Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:30
CPC Classifications
C; C07; C07D; C07D237/00; C07D237/02; C07D237/06; C07D237/10; C07D237/20; C07D237/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A PROCESS WHICH COMPRISES REACTION 3:6-DIMERCAPTOPYRIDAZINE WITH HYDRAZINE. 2, 3:6-DIMERCAPTO-PYRIDAZINE.
Claim 2
Dependent Claim
10 words
A PROCESS WHICH COMPRISES REACTION 3:6-DIMERCAPTOPYRIDAZINE WITH HYDRAZINE. 2, 3:6-DIMERCAPTO-PYRIDAZINE.
References Cited (Backward Citations)
US2484785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |