US2932657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of steroid phosphate esters
Assignee: Merck and Co Inc
•
Filing: 1957-07-30
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Granted: 1960-04-12
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Expires: 1977-07-30
Abstract
No abstract record available.
Inventors
- 👤 Burton G Christensen
- 👤 Ralph F Hirschmann
- 👤 Putter Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:55
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A PROCESS FOR PURIFYING AN AQUEOUS SOLUTION OF AN UNSATURATED PREGNANE SERIES STEROID 21-DIHYDROGEN PHOSPHATE ESTER HAVING A GENERAL FORMULA OF THE GROUP CONSISTING OF
Claim 2
Dependent Claim
25 words
A PROCESS FOR PURIFYING AN AQUEOUS SOLUTION OF AN UNSATURATED PREGNANE SERIES STEROID 21-DIHYDROGEN PHOSPHATE ESTER HAVING A GENERAL FORMULA OF THE GROUP CONSISTING OF
References Cited (Backward Citations)
US2779775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-12 | 1963-10-12 | 1964-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-12 | 1967-10-12 | 1968-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-12 | 1971-10-12 | 1972-04-12 | $7700.00 | Window Closed / Lapsed |