Patent US3708529A successfully refreshed from Google Patents.
US3708529A
Expired / Lapsed
US
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Process for preparing phenylacetic acid
Assignee: Montedison SpA
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Filing: 1970-07-22
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Granted: 1973-01-02
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Expires: 1990-07-22
Abstract
Abstract PROCESS FOR THE SYNTHESIS OF PHENYLACETIC ACID BY CARBONYLATION OF BENZYL CHLORIDE. THE PROCESS COMPRISES REACTING BENZYL CHLORIDE AND CARBON MONOXIDE UNDER ATMOSPHERIC PRESSURE, AT TEMPERATURES FROM 20* TO 80*C. IN A WATER-METHANOL MEDIUM CONTAINING UP TO 35% WATER, USING A CATALYST MIXTURE CONSISTING OF A COBALT SALT, IN IRON-MANGANESE ALLOY AND A SUPLPHURATED PROMOTING AGENT. CALCIUM OXIDE IS USED AS A NEUTRALIZING AGENT. THE CALCIUM SALT OBTAINED IS TREATED WITH A STRONG MINERAL ACID TO FREE THE PHENYLACETIC ACID.
Inventors
- 👤 L Cassar
- 👤 M Foa
- 👤 G Chiusoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/10
Claims Analysis
Total Claims: 0
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |