US2878281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of amino benzoic acids
Assignee: California Research LLC
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Filing: 1955-09-29
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Granted: 1959-03-17
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Expires: 1975-09-29
Abstract
No abstract record available.
Inventors
- 👤 William G Toland
- 👤 Charles D Heaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:34
CPC Classifications
C; C07; C07C; C07C63/00; C07C63/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PRODUCING A MIXTURE OF A PHTHALIC ACID AND AN AMINOBENZOIC ACID FROM A MIXTURE CONSISTING ESSENTIALLY OF A PHTHALIC ACID, A PHTHALIC ACID MONOAMIDE. AND A PHTHALIC ACID DIAMIDE, WHEREIN SAID PHTHALIC ACID IS SELECTED FROM THE CLASS CONSISTING OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID WHICH COMPRISES CONTACTING SAID MIXTURE WITH AQUEOUS SODIUM HYDROXIDE AND SODIUM HYPOCYLORITE AT A CONTACTING TEMPERATURE BELOW THE REACTION TEMPERATURE, RAPIDLY ELEVATING THE REACTION TEM-PERATURE TO FROM 95* TO 212*F., ACIDIFYING THE REACTION MIXTURE TO PRODUCT AN AQUEOUS MIXTURE CONTAINING SAID PHTHALIC ACID AND CORRESPONDING AMINOBENZOIC ACID, AND SEPARATING EACH OF THESE ACIDS FROM SAID AQUEOUS MIXTURE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR PRODUCING A MIXTURE OF A PHTHALIC ACID AND AN AMINOBENZOIC ACID FROM A MIXTURE CONSISTING ESSENTIALLY OF A PHTHALIC ACID, A PHTHALIC ACID MONOAMIDE. AND A PHTHALIC ACID DIAMIDE, WHEREIN SAID PHTHALIC ACID IS SELECTED FROM THE CLASS CONSISTING OF ISOPHTHALIC ACID AND TEREPHTHALIC ACID WHICH COMPRISES CONTACTING SAID MIXTURE WITH AQUEOUS SODIUM HYDROXIDE AND SODIUM HYPOCYLORITE AT A CONTACTING TEMPERATURE BELOW THE REACTION TEMPERATURE, RAPIDLY ELEVATING THE REACTION TEM-PERATURE TO FROM 95* TO 212*F., ACIDIFYING THE REACTION MIXTURE TO PRODUCT AN AQUEOUS MIXTURE CONTAINING SAID PHTHALIC ACID AND CORRESPONDING AMINOBENZOIC ACID, AND SEPARATING EACH OF THESE ACIDS FROM SAID AQUEOUS MIXTURE.
References Cited (Backward Citations)
US2722546A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |