US3839369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of delta4,9(11),16-3,20-diketo steroids
Assignee: Bayer Pharma AG
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Filing: 1973-07-16
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Granted: 1974-10-01
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Expires: 1993-07-16
Abstract
Abstract 1. A PROCESS FOR THE PRODUCTION OF $9(11),16-20-KETO STEROIDS WHICH COMPRISES HEATING A NITRATE 11,17:DIESTER OF AN 11B, 17A-DIHYDROXY-20-KETO STEROID HAVING A HYDROGEN ATOMS AT THE 9-POSITION AT A TEMPRATURE OF ABOVE 80* C, IN THE PRESENCE OF AN ALKALI SALT OR ALKALINE EARTH SALT OF A LOWER CARBOXYLIC ACID.
Inventors
- 👤 H Hofmeister
- 👤 H Laurent
- 👤 K Prezewowsky
- 👤 R Wiechert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:12
CPC Classifications
C; C07; C07J; C07J13/00; C07J13/005; C07J41/00; C07J41/0033; C07J41/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS FOR THE PRODUCTION OF $9(11),16-20-KETO STEROIDS WHICH COMPRISES HEATING A NITRATE 11,17:DIESTER OF AN 11B, 17A-DIHYDROXY-20-KETO STEROID HAVING A HYDROGEN ATOMS AT THE 9-POSITION AT A TEMPRATURE OF ABOVE 80* C, IN THE PRESENCE OF AN ALKALI SALT OR ALKALINE EARTH SALT OF A LOWER CARBOXYLIC ACID.
Claim 2
Dependent Claim
49 words
A PROCESS FOR THE PRODUCTION OF $9(11),16-20-KETO STEROIDS WHICH COMPRISES HEATING A NITRATE 11,17:DIESTER OF AN 11B, 17A-DIHYDROXY-20-KETO STEROID HAVING A HYDROGEN ATOMS AT THE 9-POSITION AT A TEMPRATURE OF ABOVE 80* C, IN THE PRESENCE OF AN ALKALI SALT OR ALKALINE EARTH SALT OF A LOWER CARBOXYLIC ACID.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |