US3303187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of tigogenin acetate and 5alpha-16-pregnene-3beta-ol-20-one from natural plant sources
Assignee: Individual
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Filing: 1965-02-26
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Granted: 1967-02-07
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Expires: 1985-02-26
Abstract
No abstract record available.
Inventors
- 👤 Rubin Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:16
CPC Classifications
C; C07; C07J; C07J71/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
THE PROCEDURE FOR RECOVERING TIGOGENIN ACETATE FROM NATURAL PLANT SOURCES WHICH COMPRISES THE FOLLOWING STPES: (A) DISSOLVING THE STEROID CONTENT OF AUTOLYZED AND FERMENTED DRIED PLANT RESIDUE IN NITROBENZENE; (B) TREATING THE NITROBENZENE SOLUTION WITH HYDRAZINE HYDRATE, THEN WITH CAUSTIC AQUEOUS DIETHYLENE GLYCOL, FOLLOWED BY HEATING UNDER CONDITIONS WHICH VAPORIZES THE WATER CONTENT AND ANY UNREACTED HYDRAZINE, THEREBY REMOVING ANY CARBONYL GROUPS FROM THE DISSOLVED STEROID; (C) TREATING THE NITROBENZENE SOLUTION WITH WATER AND DECANTING OFF THE CAUSTIC WATER LAYER, THEREBY REMOVING FATS PIGMENTS FROM THE NITROBENZENE SOLUTION, THEREAFTER DEHYDRATING BY VAPORIZING THE WATER CONTENT; (D) TREATING THE ANHYDROUS NITROBENZENE SOLUTION WITH ACETIC ANHYDRIDE AT A TEMPERATURE IN THE RANGE OF 100-120* C., THEN STEAM DISTILLING THE SOLUTION TO REMOVE THEREBY UNREACTED ACETIC ANHYDRIDE, ACETIC ACID AND THE NITROBENZENE; (E) RECOVERING THE TIGOGENIN ACETATE FROM THE STEAM DISTILLATION RESIDUE.
Claim 2
Dependent Claim
139 words
THE PROCEDURE FOR RECOVERING TIGOGENIN ACETATE FROM NATURAL PLANT SOURCES WHICH COMPRISES THE FOLLOWING STPES: (A) DISSOLVING THE STEROID CONTENT OF AUTOLYZED AND FERMENTED DRIED PLANT RESIDUE IN NITROBENZENE; (B) TREATING THE NITROBENZENE SOLUTION WITH HYDRAZINE HYDRATE, THEN WITH CAUSTIC AQUEOUS DIETHYLENE GLYCOL, FOLLOWED BY HEATING UNDER CONDITIONS WHICH VAPORIZES THE WATER CONTENT AND ANY UNREACTED HYDRAZINE, THEREBY REMOVING ANY CARBONYL GROUPS FROM THE DISSOLVED STEROID; (C) TREATING THE NITROBENZENE SOLUTION WITH WATER AND DECANTING OFF THE CAUSTIC WATER LAYER, THEREBY REMOVING FATS PIGMENTS FROM THE NITROBENZENE SOLUTION, THEREAFTER DEHYDRATING BY VAPORIZING THE WATER CONTENT; (D) TREATING THE ANHYDROUS NITROBENZENE SOLUTION WITH ACETIC ANHYDRIDE AT A TEMPERATURE IN THE RANGE OF 100-120* C., THEN STEAM DISTILLING THE SOLUTION TO REMOVE THEREBY UNREACTED ACETIC ANHYDRIDE, ACETIC ACID AND THE NITROBENZENE; (E) RECOVERING THE TIGOGENIN ACETATE FROM THE STEAM DISTILLATION RESIDUE.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |