Patent US2957866A successfully refreshed from Google Patents.
US2957866A
Expired / Lapsed
US
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Strychnos hydrazinium compounds
Assignee: WR Grace and Co
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Filing: 1958-10-30
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Granted: 1960-10-25
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Expires: 1978-10-30
Abstract
No abstract record available.
Inventors
- 👤 Rudner Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:54
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
4 words
COMPOUNDS HAVING THE FORMULA:
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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |