US3130223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing phenacetin
Assignee: Dow Chemical Co
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Filing: 1960-10-21
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Granted: 1964-04-21
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Expires: 1980-10-21
Abstract
No abstract record available.
Inventors
- 👤 William R Surine
- 👤 Wesley C Stoesser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:21
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN A PROCESS FOR LPREPARING PHENACETIN WHICH COMPRISES REACTING BY CONTACTING AT BETWEEN ABOUT 20* TO ABOUT 130*C. PARA-PHENETIDINE WITH ACETIC ANHYDRIDE, THE IMPROVEMENT WHICH CONSISTS OF CARRYING OUT THE REACTION IN THE PRESENCE OF ACETIC ACID IN AN AMOUNT OF AT LEAST 0.5 MOLE PERCENT OF PHENETIDINE IN EXCESS OF THAT PRODUCED DURING THE REACTION AND CRYSTALLIZING THE PHENACETIN DIRECTLY FROM THE ACETIC ACID RICH REACTION MIXTURE; RECOVERING THE CRYSTALLIZED PHENACETIN; RECOVERING A PORTION OF THE ACETIC ACID BY DISTILLATION OF THE MOTHER LIQUOR; AND, RECYCLING THE RESULTING CONCENTRATED MOTHER LIQUOR OBTAINED TO THE REACTION.
Claim 2
Dependent Claim
96 words
IN A PROCESS FOR LPREPARING PHENACETIN WHICH COMPRISES REACTING BY CONTACTING AT BETWEEN ABOUT 20* TO ABOUT 130*C. PARA-PHENETIDINE WITH ACETIC ANHYDRIDE, THE IMPROVEMENT WHICH CONSISTS OF CARRYING OUT THE REACTION IN THE PRESENCE OF ACETIC ACID IN AN AMOUNT OF AT LEAST 0.5 MOLE PERCENT OF PHENETIDINE IN EXCESS OF THAT PRODUCED DURING THE REACTION AND CRYSTALLIZING THE PHENACETIN DIRECTLY FROM THE ACETIC ACID RICH REACTION MIXTURE; RECOVERING THE CRYSTALLIZED PHENACETIN; RECOVERING A PORTION OF THE ACETIC ACID BY DISTILLATION OF THE MOTHER LIQUOR; AND, RECYCLING THE RESULTING CONCENTRATED MOTHER LIQUOR OBTAINED TO THE REACTION.
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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |