Patent US2683153A successfully refreshed from Google Patents.
US2683153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of 20-keto-21, 21-dihydroxy steroids to delta17, 20-20-hydroxy-21-oxo-steroids
Assignee: Research Corp
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Filing: 1950-11-20
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Granted: 1954-07-06
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Expires: 1970-11-20
Abstract
No abstract record available.
Inventors
- 👤 Edward C Kendall
- 👤 Gerard A Fleisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:28
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
THE METHOD WHICH COMPRISES HEATING A3(A)ACYLOXY-21,21-DIHYDROXY-11,20-DIKETO-12(A)HALOPREGNANE WHEREIN THE ACYL GROUP IS A LOWER FATTY ACID RADICAL WITH AN ORGANIC NITROGEN BASE TO PRODUCE A 3(A)-ACYLOXY-20-HYDROXY-11-KETO12(A)-HALO-$17,20-PREGNENE-21-AL.
Claim 2
Independent Claim
25 words
THE METHOD WHICH COMPRISES HEATING A3(A)ACYLOXY-21,21-DIHYDROXY-11,20-DIKETO-12(A)HALOPREGNANE WHEREIN THE ACYL GROUP IS A LOWER FATTY ACID RADICAL WITH AN ORGANIC NITROGEN BASE TO PRODUCE A 3(A)-ACYLOXY-20-HYDROXY-11-KETO12(A)-HALO-$17,20-PREGNENE-21-AL.
References Cited (Backward Citations)
US2577018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-05 | 1958-01-04 | 1958-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-05 | 1962-01-04 | 1962-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-05 | 1966-01-04 | 1966-07-06 | $7700.00 | Window Closed / Lapsed |