US3071614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of aromatic acids
Assignee: Standard Oil Co
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Filing: 1957-10-25
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Granted: 1963-01-01
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Expires: 1977-10-25
Abstract
No abstract record available.
Inventors
- 👤 James O Knobloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:12
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN A PROCESS FOR PURIFYING AN AROMATIC HYDROCARBON CARBOXYLIC ACID WHICH IS CONTAMINATED WITH TRACES OF TARLIKE BYPRODUCTS OF THE HEAVY-METAL-CATALYZED LIQUID-PHASE MOLECULAR-OXYGEN OXIDATION OF AN ALIPHATIC SUBSTITUTED AROMATIC COMPOUND, THE IMPROVEMENT OF CONTACTING AN AQUEOUS SOLUTION CONTAINING AROMATIC HYDROCARBON CARBOXYLIC ACID AND SAID BYPRODUCTS WITH ADSORBENT ALUMINA, WHEREBY SAID BYPRODUCTS ARE SELECTIVELY ADSORBED ONTO THE ALUMINA.
Claim 2
Dependent Claim
57 words
IN A PROCESS FOR PURIFYING AN AROMATIC HYDROCARBON CARBOXYLIC ACID WHICH IS CONTAMINATED WITH TRACES OF TARLIKE BYPRODUCTS OF THE HEAVY-METAL-CATALYZED LIQUID-PHASE MOLECULAR-OXYGEN OXIDATION OF AN ALIPHATIC SUBSTITUTED AROMATIC COMPOUND, THE IMPROVEMENT OF CONTACTING AN AQUEOUS SOLUTION CONTAINING AROMATIC HYDROCARBON CARBOXYLIC ACID AND SAID BYPRODUCTS WITH ADSORBENT ALUMINA, WHEREBY SAID BYPRODUCTS ARE SELECTIVELY ADSORBED ONTO THE ALUMINA.
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) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |