Patent US4163744A successfully refreshed from Google Patents.
US4163744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of steroids
Assignee: Individual
•
Filing: 1978-02-10
•
Granted: 1979-08-07
•
Expires: 1998-02-10
Abstract
Abstract The synthesis of 1α,25-dihydroxycholesterol, 1α,25-dihydroxy-7-dehydrocholesterol and 1α,25-dihydroxycholecalciferol and other sterol derivatives from bile acids. Also the synthesis of 3,6-diketo steroids useful in the production of 1α,25-dihydroxycholesterol and other sterols which are biologically active or can be converted to biologically active sterols. The invention involves the sterols so produced and the processes by which they are prepared.
Inventors
- 👤 Emil T. Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:07
CPC Classifications
C; C07; C07J; C07J31/00; C07J31/006; C07J21/00; C07J21/005; C07J21/006; C07J41/00; C07J41/0033; C07J41/0094; C07J9/00; C07J9/005
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
15 words
A steroid compound having the structure ##STR11## in which R is a lower alkyl group.
Claim 2
Dependent Claim
15 words
A steroid compound having the structure ##STR11## in which R is a lower alkyl group.
Claim 3
Dependent Claim
14 words
A steroid compound as set forth in claim 1 in which R is methyl.
Claim 4
Dependent Claim
7 words
A steroid compound having the structure ##STR12##
Claim 5
Dependent Claim
7 words
A steroid compound having the structure ##STR12##
Claim 6
Dependent Claim
17 words
A steroid compound having the structure ##STR13## in which P is an aliphatic or aromatic sulfonyl group.
Claim 7
Dependent Claim
17 words
A steroid compound having the structure ##STR13## in which P is an aliphatic or aromatic sulfonyl group.
Claim 8
Dependent Claim
14 words
A steroid compound as set forth in claim 4 in which P is p-toluenesulfonyl.
Claim 9
Dependent Claim
7 words
A steroid compound having the structure ##STR14##
Claim 10
Dependent Claim
7 words
A steroid compound having the structure ##STR14##
Claim 11
Dependent Claim
7 words
A steroid compound having the structure ##STR15##
Claim 12
Dependent Claim
7 words
A steroid compound having the structure ##STR15##
Claim 13
Dependent Claim
15 words
A steroid compound having the structure ##STR16## where R is an alkyl or aryl group.
Claim 14
Dependent Claim
15 words
A steroid compound having the structure ##STR16## where R is an alkyl or aryl group.
Claim 15
Dependent Claim
13 words
A steroid compound as set forth in claim 8 where R is methyl.
Claim 16
Dependent Claim
7 words
A steroid compound having the structure ##STR17##
Claim 17
Dependent Claim
7 words
A steroid compound having the structure ##STR17##
References Cited (Backward Citations)
DE32176C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |