US3033899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallization of benzene tricarboxylic acids from aqueous solutions
Assignee: Standard Oil Co
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Filing: 1957-12-02
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Granted: 1962-05-08
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Expires: 1977-12-02
Abstract
No abstract record available.
Inventors
- 👤 James O Knobloch
- 👤 Hsiang P Liao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:06
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A PROCESS FOR THE CRYSTALLIZATION FROM AN AQUEOUS SOLUTION OF A BENZENE TRICARBOXYLIC ACID DERIVED FROM THE LIQUID PHASE OXIDATION OF A TRIALKYL SUBSTITUTED BENZENE IN THE PRESENCE OF A HEAVY METAL OXIDATION CATALYST WHEREIN CRYSTALLIZATION IS ORDINARILY SLOW AND WHEREIN OXIDATION CATALYST IN SAID SOLUTION COPRECIPITATES WITH THE ACID, THE IMPROVEMENT OF EFFECTING SAID CRYSTALLIZTION IN THE PRESENCE OF FROM ABOUT 0.05 TO 20 WEIGHT PERCENT OF A MINERAL ACID HAVING A FIRST HYDROGEN ION IONIZATION CONSTANT GREATER THAN 3.2X10**3 AT 25* C. WHEREBY THE CRYSTALLIZATION TIME IS DECREASED AND WHEREBY THE OXIDATION CATALYST IS RETAINED IN SAID SOLUTION, AND
Claim 2
Dependent Claim
102 words
IN A PROCESS FOR THE CRYSTALLIZATION FROM AN AQUEOUS SOLUTION OF A BENZENE TRICARBOXYLIC ACID DERIVED FROM THE LIQUID PHASE OXIDATION OF A TRIALKYL SUBSTITUTED BENZENE IN THE PRESENCE OF A HEAVY METAL OXIDATION CATALYST WHEREIN CRYSTALLIZATION IS ORDINARILY SLOW AND WHEREIN OXIDATION CATALYST IN SAID SOLUTION COPRECIPITATES WITH THE ACID, THE IMPROVEMENT OF EFFECTING SAID CRYSTALLIZTION IN THE PRESENCE OF FROM ABOUT 0.05 TO 20 WEIGHT PERCENT OF A MINERAL ACID HAVING A FIRST HYDROGEN ION IONIZATION CONSTANT GREATER THAN 3.2X10**3 AT 25* C. WHEREBY THE CRYSTALLIZATION TIME IS DECREASED AND WHEREBY THE OXIDATION CATALYST IS RETAINED IN SAID SOLUTION, AND
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) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |