US3621014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
17{60 ,21-orthocarbonates of steroid derivatives
Assignee: Hoechst AG
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Filing: 1969-01-14
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Granted: 1971-11-16
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Expires: 1989-01-14
Abstract
Abstract The present invention relates to 17 Alpha ,21-orthocarbonates of steroid derivatives.
Inventors
- 👤 Ulrich Stache
- 👤 Werner Haede
- 👤 Werner Fritsch
- 👤 Kurt Radscheit
- 👤 Hans-Georg Schroder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:43
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/56; A61K31/57; A61K31/573; A61K31/58; C; C07; C07J; C07J21/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
6 Alpha ,9 Alpha -Difluoro-16 Alpha -methyl-prednisolone-17 Alpha ,21-diethyl-orthocarbonate.
Claim 2
Dependent Claim
9 words
6 Alpha ,9 Alpha -Difluoro-16 Alpha -methyl-prednisolone-17 Alpha ,21-dimethyl-orthocarbonate.
Claim 3
Dependent Claim
9 words
6 Alpha ,9 Alpha -Difluoro-16 Alpha -methyl-prednisolone-17 Alpha ,21-bis-(n-propyl)-orthocarbonate.
Claim 4
Dependent Claim
9 words
6 Alpha ,9 Alpha -Difluoro-16 Alpha -methyl-prednisolone-17 Alpha ,21-bis-(n-butyl)-orthocarbonate.
References Cited (Backward Citations)
US3312591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |