Patent US2854451A successfully refreshed from Google Patents.
US2854451A
Expired / Lapsed
US
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11-keto-tigogenin
Assignee: Merck and Co Inc
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Filing: 1951-09-20
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Granted: 1958-09-30
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Expires: 1971-09-20
Abstract
No abstract record available.
Inventors
- 👤 Earl M Chamberlin
- 👤 John M Chemerda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:51
CPC Classifications
C; C07; C07J; C07J9/00; C07J75/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
A COMPOUND FROM THE GROUP CONSISTING OF 11-KETOTIGOGENIN AND 3-ACYLOXY-11-KETOTIGOGENIN WHEREIN THE ACYL SUBSTITUENT IS A LOWER FATTY ACID RADICAL.
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |