Patent FR2200675B3 successfully refreshed from Google Patents.
Patent US2735855A successfully refreshed from Google Patents.
US2735855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
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Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:02
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PRODUCTION OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF $4-PREGNEN-11A,21DIOL-3,20-DIONE, LOWER FATTY ACID ESTERS THEREOF AND BENZOIC ACID ESTERS THEREOF WHICH COMPRISES TREATING A COMPOUND SELECTED FROM THE CLASS CONSISTING OF ALLOPREGNAN11A,21-DIOL-3,20-DIONE, LOWER FATTY ACID ESTERS THEREOF AND BENZOIC ACID ESTERS THEREOF WITH APPROXIMATELY 2 MOLAR EQUIVALENTS OF BROMINE TO FORM A 2,4-DIBROMO DERIVATICE, TREATING SAID DIBROMO DERIVATIVE WITH AN ALKALI METAL IODIDE IN THE PRESENCE OF A LOWER ALPHATIC KETONE TO FORM THE CORRESPONDING 2-IODO-$4-COMPOUND AND THEN TREATING THE 2-IODO-$4-COMPOUND WITH A DEIODINATING AGENT.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PRODUCTION OF A COMPOUND SELECTED FROM THE CLASS CONSISTING OF $4-PREGNEN-11A,21DIOL-3,20-DIONE, LOWER FATTY ACID ESTERS THEREOF AND BENZOIC ACID ESTERS THEREOF WHICH COMPRISES TREATING A COMPOUND SELECTED FROM THE CLASS CONSISTING OF ALLOPREGNAN11A,21-DIOL-3,20-DIONE, LOWER FATTY ACID ESTERS THEREOF AND BENZOIC ACID ESTERS THEREOF WITH APPROXIMATELY 2 MOLAR EQUIVALENTS OF BROMINE TO FORM A 2,4-DIBROMO DERIVATICE, TREATING SAID DIBROMO DERIVATIVE WITH AN ALKALI METAL IODIDE IN THE PRESENCE OF A LOWER ALPHATIC KETONE TO FORM THE CORRESPONDING 2-IODO-$4-COMPOUND AND THEN TREATING THE 2-IODO-$4-COMPOUND WITH A DEIODINATING AGENT.
References Cited (Backward Citations)
US2602769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |