Patent US3836550A successfully refreshed from Google Patents.
US3836550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chenodeoxycholic acid
Assignee: Individual
•
Filing: 1973-05-25
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Granted: 1974-09-17
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Expires: 1993-05-25
Abstract
Abstract THE INVENTION RELATES TO A PROCES FOR THE PREPARATION OF CHENODEOXYCHLOLIC ACID OF HIGH PURITY BY A PROCESS IN WHICH CRUDE CHENODEOXYCHOLIC ACID IS PRECIPITATED IN THE FORM OF ITS CALCIUM OR STRONTIUM SALT WHICH IS THEN ACIDIFIED TO LIBERATE THE PURIFIED ACID WHICH IS THEN RECOVERED.
Inventors
- 👤 M Burge
- 👤 W Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:04
CPC Classifications
C; C07; C07J; C07J9/00
Claims Analysis
Total Claims: 0
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |