US4284577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel vitamin D3 derivative and process for preparing the same
Assignee: Individual
•
Filing: 1980-02-07
•
Granted: 1981-08-18
•
Expires: 2000-02-07
Abstract
Abstract A novel vitamin D 3 derivative of the formula ##STR1## (wherein R 1 is hydrogen or a hydroxyl group) which exhibits strong biological activity like that of vitamin D and is useful as a medicine; and a process for producing the same are disclosed.
Inventors
- 👤 Sachiko Yamada
- 👤 Masayuki Ohmori
- 👤 Hiroaki Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:17
CPC Classifications
C; C07; C07J; C07J9/00; C07J17/00; C07J33/00; C07J33/002; C07J9/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
A provitamin D 3 derivative of the formula: ##STR13## wherein R 2 , R 3 and R 4 may be the same or different and represent hydrogen or a hydroxyl-protecting group.
Claim 2
Dependent Claim
31 words
A provitamin D 3 derivative of the formula: ##STR13## wherein R 2 , R 3 and R 4 may be the same or different and represent hydrogen or a hydroxyl-protecting group.
Claim 3
Dependent Claim
7 words
A steroid derivative of the formula: ##STR14##
Claim 4
Dependent Claim
7 words
A steroid derivative of the formula: ##STR14##
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |