US3022312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing steroid derivatives
Assignee: Monsanto Chemicals Ltd
•
Filing: 1956-03-19
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Granted: 1962-02-20
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Expires: 1976-03-19
Abstract
No abstract record available.
Inventors
- 👤 Bernard S Wildi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:35
CPC Classifications
C; C07; C07J; C07J73/00; C07J73/001; C07J73/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A METHOD OF PREPARING 3-KETO-4AZA-$5-CYCLOPENTANOPOLYHYDROPHENANTHRENES WHCH COMPRISES HEATING A 3,5SECO-5-KETO-3-OIC CYCLOPENTANO-10,13-DIMETHYLPOLYHYDROPHENANTHRENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND R-NH2 IN WHICH R IS ALKYL OF 1 TO 8 CARBON ATOMS AT TEMPERATURE OF 100 TO 250*C. TO FORM THE SAID 3-KETO-4-AZA-$5-CYCLOPENTANOPOLYHYDROPHENANTHRENE.
Claim 2
Independent Claim
45 words
A METHOD OF PREPARING 3-KETO-4AZA-$5-CYCLOPENTANOPOLYHYDROPHENANTHRENES WHCH COMPRISES HEATING A 3,5SECO-5-KETO-3-OIC CYCLOPENTANO-10,13-DIMETHYLPOLYHYDROPHENANTHRENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND R-NH2 IN WHICH R IS ALKYL OF 1 TO 8 CARBON ATOMS AT TEMPERATURE OF 100 TO 250*C. TO FORM THE SAID 3-KETO-4-AZA-$5-CYCLOPENTANOPOLYHYDROPHENANTHRENE.
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |