US2871244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of anthraquinone and derivatives thereof
Assignee: Reynolds Metals Co
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Filing: 1955-06-24
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Granted: 1959-01-27
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Expires: 1975-06-24
Abstract
No abstract record available.
Inventors
- 👤 Kamlet Jonas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:39
CPC Classifications
C; C07; C07C; C07C65/00; C07C65/32; C07C65/34; C07C46/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A PROCESS FOR THE MANUFACTURING OF ANTHRAQUINONE COMPOUNDS WHEREIN AN ALUMINUM SALT OF AN AROYLARYLCARBOXYLIC ACID IS COVERED TO THE CORRESPONDING AROYLARYLCARBOXYLIC ACID AND THE SAID AROYLARYLCARBOXYLIC ACID IS CYCLIZED WITH SULFURIC ACID, THE STEP WHICH COMPRISES REACTING WITH PHTHALIC ANHYDRIDE THE COMPLEXES FORMED BY THE REACTION OF METALLIC ALUMINUM WITH A HYDROGEN HALIDE FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN BROMIDE, AND WITH AN AROMATIC COMPOUND OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
74 words
IN A PROCESS FOR THE MANUFACTURING OF ANTHRAQUINONE COMPOUNDS WHEREIN AN ALUMINUM SALT OF AN AROYLARYLCARBOXYLIC ACID IS COVERED TO THE CORRESPONDING AROYLARYLCARBOXYLIC ACID AND THE SAID AROYLARYLCARBOXYLIC ACID IS CYCLIZED WITH SULFURIC ACID, THE STEP WHICH COMPRISES REACTING WITH PHTHALIC ANHYDRIDE THE COMPLEXES FORMED BY THE REACTION OF METALLIC ALUMINUM WITH A HYDROGEN HALIDE FROM THE GROUP CONSISTING OF HYDROGEN CHLORIDE AND HYDROGEN BROMIDE, AND WITH AN AROMATIC COMPOUND OF THE GENERAL FORMULA:
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |