Patent US3764664A successfully refreshed from Google Patents.
US3764664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of active anhydrous aluminum chloride
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1971-06-14
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Granted: 1973-10-09
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Expires: 1991-06-14
Abstract
Abstract Aromatic ketocarboxylic acids represented by the formula, WHEREIN R1 and R2 are individually hydrogen, chlorine, or a straight or branched lower alkyl or a substituted or unsubstituted cycloalkyl, are prepared by reacting phthalic anhydride with a compound represented by the formula, WHEREIN R1 and R2 are as defined above, in the presence of a specific aluminum chloride catalyst. The specific aluminum chloride is prepared by reacting metallic aluminum with anhydrous hydrogen chloride using at least one member of trihalogenated benzenes as a solvent.
Inventors
- 👤 H Suda
- 👤 T Kanda
- 👤 Y Murata
- 👤 H Hida
- 👤 T Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:57
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; C; C01; C01F; C01F7/00; C01F7/48; C01F7/56; C01F7/58; C07; C07C; C07C51/00; C07C51/347; C07C51/373
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
21 words
A process according to claim 1, wherein the reaction is started in the presence of a minute amount of aluminum chloride.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |