Patent US2810758A successfully refreshed from Google Patents.
US2810758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steroid and intermediate compounds
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1955-05-26
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Granted: 1957-10-22
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Expires: 1975-05-26
Abstract
No abstract record available.
Inventors
- 👤 William S Johnson
- 👤 Bannister Brian
- 👤 Edgar R Rogier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:28
CPC Classifications
C; C07; C07J; C07J63/00; C07J63/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 1-KETO-8-HYDROXY-10A-METHYL-OCTADECAHYDROCHRYSENE AND 1,8-DIKETO-10A-METHYL-OCTADECAHYDROCHRYSENE.
Claim 2
Dependent Claim
43 words
THE PROCESS WHICH COMPRISES REDUCING 1-LOWER ALKOXY-8-HYDROXY-10A-METHYL-4B,5,6,6A,7,8,9,10,10A, 10B,11,12-DODECAHYDROCHRYSENE IN A LIQUID AMMONIA-ALCOHOLIC-LITHIUM REACTION MIXTURE, HYDROLYZING THE RESULTING PRODUCT BY HEATING IN AQUEOUS ACID, CATALYTICALY REDUCING WITH PALLADIUM CATALYST THE 13(14)-AND 16(17)-DEHYDRO-KETONES TO 1-KETO-8-HYDROXY-10A-METHYL-OCTA DECAHYDROCHRYSENE AND OXIDIZING THE LATTER WITH CHROMIC OXIDE TO 1,8-DIKETO-10A-METHYL-OCTADECAHYDROCHRYSENE.
References Cited (Backward Citations)
CH235431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |