US2802854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing phosphoric acid esters of diethylstilbestrol
Assignee: Asta Medica GmbH
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Filing: 1953-04-06
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Granted: 1957-08-13
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Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Arnold Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:30
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A METHOD OF PREPARING PHOSPHORIC ACID ESTERS OF DIETHYLSTIBESTROL COMPRISING REACTING PHOSPHORUS OXYCHLORIDE WITH DIETHYLSTIBESTROL IN THE PRESENCE OF ORGANIC INTROGEN BASES IN AN AMOUNT JUST SUFFICIENT TO COMBINE WITH THE TOTAL HYDROGEN CHLORIDE DEVELOPED DURING THE REACTION, HEATING THE REACTION MIXTURE AT THE BOILING POINT OF THE PHOSPHORUS OXYCHLORIDE, CONVERTING THE THUS OBTAINED ESTER INTO ITS ETHER ADDUCT, AND RECOVERING THE PURE ESTER FROM SAID ADDUCT.
Claim 2
Independent Claim
67 words
A METHOD OF PREPARING PHOSPHORIC ACID ESTERS OF DIETHYLSTIBESTROL COMPRISING REACTING PHOSPHORUS OXYCHLORIDE WITH DIETHYLSTIBESTROL IN THE PRESENCE OF ORGANIC INTROGEN BASES IN AN AMOUNT JUST SUFFICIENT TO COMBINE WITH THE TOTAL HYDROGEN CHLORIDE DEVELOPED DURING THE REACTION, HEATING THE REACTION MIXTURE AT THE BOILING POINT OF THE PHOSPHORUS OXYCHLORIDE, CONVERTING THE THUS OBTAINED ESTER INTO ITS ETHER ADDUCT, AND RECOVERING THE PURE ESTER FROM SAID ADDUCT.
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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |