Patent US2599471A successfully refreshed from Google Patents.
US2599471A
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Octahydrophenanthrene carboxylic acid esters and process of making same
Assignee: CIBA PHARM PROD Inc
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Filing: 1948-03-29
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Granted: 1952-06-03
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Expires: 1968-03-29
Abstract
No abstract record available.
Inventors
- 👤 Miescher Karl
- 👤 Anner Georg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:34
CPC Classifications
C; C07; C07B; C07B57/00; C07B2200/00; C07B2200/07; C07C; C07C2602/00; C07C2602/02; C07C2602/04; C07C2602/10; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/22; C07C2603/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS FOR THE ISOLATION OF INDIVIDUAL DIASTEREOISOMERS OF 1-KETO-2-LOWER-ALKYL-7-LOWERAKLOXY - 1,2,3,4,9,10,11,12 - OCTAHYDROPHENAN THRENE-2-CARBOXYLIC ACID ESTERS FROM A DIASTEREOISOMERIC MIXTURE THEREOF, WHICH COMPRISES SUBJECTING THE DIASTEREOISOMERIC MIXTURE OF THE SAID ESTERS TO A FRACTIONAL CRYSTALLIZATION WITH THE AID OF ACETONE.
Claim 2
Dependent Claim
41 words
A PROCESS FOR THE ISOLATION OF INDIVIDUAL DIASTEREOISOMERS OF 1-KETO-2-LOWER-ALKYL-7-LOWERAKLOXY - 1,2,3,4,9,10,11,12 - OCTAHYDROPHENAN THRENE-2-CARBOXYLIC ACID ESTERS FROM A DIASTEREOISOMERIC MIXTURE THEREOF, WHICH COMPRISES SUBJECTING THE DIASTEREOISOMERIC MIXTURE OF THE SAID ESTERS TO A FRACTIONAL CRYSTALLIZATION WITH THE AID OF ACETONE.
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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |