Patent US3007942A successfully refreshed from Google Patents.
US3007942A
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US
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Resolution of trimesic and trimellitic acid
Assignee: Standard Oil Co
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Filing: 1957-11-19
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Granted: 1961-11-07
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Expires: 1977-11-19
Abstract
No abstract record available.
Inventors
- 👤 Donald E Burney
- 👤 James O Knobloch
- 👤 Hsiang P Liao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:52
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C51/54; C07C51/573
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR RESOLVING A MIXTURE OF TRIMESIC ACID AND TRIMELLITIC ACID WHICH COMPRISES: HEATING THE MIXTURE AT A TEMPERATURE SUFFICIENT TO CONVERT TRIMELLITIC ACID TO TRIMELLITIC ANHYDRIDE, EXTRACTING THE TRIMELLITIC ANHYDRIDE FROM THE MIXTURE WITH AN AROMATIC HYDROCARBON SOLVENT, AND RECOVERING THE EXTRACTED TRIMELLITIC ANHYDRIDE.
Claim 2
Dependent Claim
46 words
A PROCESS FOR RESOLVING A MIXTURE OF TRIMESIC ACID AND TRIMELLITIC ACID WHICH COMPRISES: HEATING THE MIXTURE AT A TEMPERATURE SUFFICIENT TO CONVERT TRIMELLITIC ACID TO TRIMELLITIC ANHYDRIDE, EXTRACTING THE TRIMELLITIC ANHYDRIDE FROM THE MIXTURE WITH AN AROMATIC HYDROCARBON SOLVENT, AND RECOVERING THE EXTRACTED TRIMELLITIC ANHYDRIDE.
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) | 1964-11-06 | 1965-05-08 | 1965-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-06 | 1969-05-08 | 1969-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-06 | 1973-05-08 | 1973-11-07 | $7700.00 | Window Closed / Lapsed |