US4552698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
23,23-Difluoro-1α,25-dihydroxy-vitamin D3
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1984-08-13
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Granted: 1985-11-12
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Expires: 2004-08-13
Abstract
Abstract The invention provides new derivatives of vitamin D, 23,23-difluoro-1,25-dihydroxycholecalciferol and the acylates thereof. The derivative compounds are characterized by vitamin D-like activity.
Inventors
- 👤 Hector F. DeLuca
- 👤 Yoko Tanaka
- 👤 Nobuo Ikekawa
- 👤 Yoshiro Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:46
CPC Classifications
C; C07; C07J; C07J31/00; C07J31/006; C07C; C07C401/00; C07J17/00; C07J53/00; C07J53/002; C07J9/00; C07J9/005; C12; C12P; C12P7/00; C12P7/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
49 words
Compounds having the formula ##STR4## wherein each of R, R 1 and R 2 is selected from the group consisting of hydrogen, an acyl group having from one to about four carbon atoms and benzoyl with the proviso that R, R 1 and R 2 cannot all be hydrogen.
Claim 2
Dependent Claim
49 words
Compounds having the formula ##STR4## wherein each of R, R 1 and R 2 is selected from the group consisting of hydrogen, an acyl group having from one to about four carbon atoms and benzoyl with the proviso that R, R 1 and R 2 cannot all be hydrogen.
Claim 3
Dependent Claim
15 words
The compound according to claim 1 wherein R, R 1 and R 2 are acetyl.
Claim 4
Dependent Claim
15 words
The compound according to claim 1 wherein R, R 1 and R 2 are benzoyl.
Claim 5
Dependent Claim
8 words
The compounds of claim 1 in crystalline form.
References Cited (Backward Citations)
US4284577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |