Patent US3081298A successfully refreshed from Google Patents.
US3081298A
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US
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New cyclohemiacetals and cyclohemiacetal esters of the pregnane series and a processfor their manufacture
Assignee: BASF Corp
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Filing: 1960-08-26
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Granted: 1963-03-12
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Expires: 1980-08-26
Abstract
No abstract record available.
Inventors
- 👤 Wettstein Albert
- 👤 Schmidlin Julius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:38
CPC Classifications
C; C07; C07J; C07J71/00; C07J75/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
PROCESS FOR THE MANUFACTURE OF 18(21) -CYCLOHEMIACETALS OF 18:20-DIOXO-21-HYDROXY-PREGNANE COMPOUNDS, WHEREIN A MEMBER SELECTED FROM THE GROUP CONSISTING OF SATURATED AND UNSATURATED 20-KETALS OF 18:21:DIHYDROXY: 20-OXO-PREGNANES, WHICH CONTAIN IN THE 3-POSITION A MEMBER SELECTED FROM THE GROUP CONSISTING OF A FREE-, AN ESGERIFIED- AND A KETALIZED HYDROXYL GROUP, A FREE, AN ENOLIZED- AND A KETALIZED OXO GROUP, IS DEHYDROGENATED WITH A COMPOUND OF HEXAVALENT CHROMINUM IN THE PRESENCE OF A DILUENT TO OBTAIN THE 18(21)-CYCLOHEMIACETAL OF A 20KETALIZED-18-OXO-21-HYDROXY-20-KETO PREGNANE, AN IN THE RESULTING DEHYDROGENATION PRODUCT THE KETAL GROUP IN THE 20-POSITION IS HYDROLYSED BY TREATMENT WITH A STRONG OXYGEN-COMTAINING INORGANIC ACID IN THE PRESENCE OF A LOWER ALIPHATIC CARBOXYLIC ACID.
Claim 2
Dependent Claim
110 words
PROCESS FOR THE MANUFACTURE OF 18(21) -CYCLOHEMIACETALS OF 18:20-DIOXO-21-HYDROXY-PREGNANE COMPOUNDS, WHEREIN A MEMBER SELECTED FROM THE GROUP CONSISTING OF SATURATED AND UNSATURATED 20-KETALS OF 18:21:DIHYDROXY: 20-OXO-PREGNANES, WHICH CONTAIN IN THE 3-POSITION A MEMBER SELECTED FROM THE GROUP CONSISTING OF A FREE-, AN ESGERIFIED- AND A KETALIZED HYDROXYL GROUP, A FREE, AN ENOLIZED- AND A KETALIZED OXO GROUP, IS DEHYDROGENATED WITH A COMPOUND OF HEXAVALENT CHROMINUM IN THE PRESENCE OF A DILUENT TO OBTAIN THE 18(21)-CYCLOHEMIACETAL OF A 20KETALIZED-18-OXO-21-HYDROXY-20-KETO PREGNANE, AN IN THE RESULTING DEHYDROGENATION PRODUCT THE KETAL GROUP IN THE 20-POSITION IS HYDROLYSED BY TREATMENT WITH A STRONG OXYGEN-COMTAINING INORGANIC ACID IN THE PRESENCE OF A LOWER ALIPHATIC CARBOXYLIC ACID.
Claim 3
Dependent Claim
13 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE GENERAL FORMULA
Claim 4
Dependent Claim
13 words
A MEMBER SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF THE GENERAL FORMULA
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) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |