US2844513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for splitting racemates
Assignee: CIBA PHARM PROD Inc
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Filing: 1956-07-18
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Granted: 1958-07-22
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Expires: 1976-07-18
Abstract
No abstract record available.
Inventors
- 👤 Wettstein Albert
- 👤 Vischer Ernst
- 👤 Meystre Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:57
CPC Classifications
C; C12; C12P; C12P33/00; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/826; Y10S435/831; Y10S435/832; Y10S435/839; Y10S435/843; Y10S435/85; Y10S435/859; Y10S435/863; Y10S435/866; Y10S435/874; Y10S435/886; Y10S435/896; Y10S435/911; Y10S435/913; Y10S435/917; Y10S435/929; Y10S435/931; Y10S435/933; Y10S435/939; Y10S435/945
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
PROCESS FOR SPLITTING RACEMATES OF D,1-STEROIDS, WHEREIN A D,1-STEROID IS SUBJECTED TO THE ACTION OF OXIDIZING ENAT LEAST ONE OF THE POSITIONS 6, 7, 11, 15 AND 16 SO AS TO AS TO OXIDIZE ONLY THE D-FORM AND SEPARATING THE RESULTING OXIDIZED D-FORM AND THE UNOXIDIZED 1-FORM.
Claim 2
Dependent Claim
47 words
PROCESS FOR SPLITTING RACEMATES OF D,1-STEROIDS, WHEREIN A D,1-STEROID IS SUBJECTED TO THE ACTION OF OXIDIZING ENAT LEAST ONE OF THE POSITIONS 6, 7, 11, 15 AND 16 SO AS TO AS TO OXIDIZE ONLY THE D-FORM AND SEPARATING THE RESULTING OXIDIZED D-FORM AND THE UNOXIDIZED 1-FORM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |