Patent US4307231A successfully refreshed from Google Patents.
US4307231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitamin D-lactone derivative and process for preparing same
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1980-07-18
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Granted: 1981-12-22
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Expires: 2000-07-18
Abstract
Abstract The invention provides a new vitamin D compound, 1α,25-dihydroxy-vitamin D 3 26,23-lactone. The compound is characterized by vitamin D-like activity.
Inventors
- 👤 Hector F. DeLuca
- 👤 Heinrich K. Schnoes
- 👤 Yoko Tanaka
- 👤 Herbert E. Paaren
- 👤 Joseph K. Wichmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:48
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/26; C07D307/30; C07D307/32; C07D307/33
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
4 words
1α,25-dihydroxyvitamin D 3 26,23-lactone.
Claim 2
Dependent Claim
4 words
1α,25-dihydroxyvitamin D 3 26,23-lactone.
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) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |