US2785199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of toluic acids
Assignee: Richfield Oil Corp
•
Filing: 1952-07-01
•
Granted: 1957-03-12
•
Expires: 1972-07-01
Abstract
No abstract record available.
Inventors
- 👤 Chester M Himel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:48
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN A METHOD FOR THE PURIFICATION OF TOLUIC ACIDS PREPARED BY THE LIQUID PHASE AIR OXIDATION OF XYLENES, THE STEPS COMPRISING SUBJECTING THE REACTION PRODUCT TO A DISFILLATION OPERATION TO REMOVE XYLENES AND OBTAIN TOLUIC ACIDS ADMIXED WITH NEUTRAL MATERIALS HAVING A BOILING RANGE CLOSE TO THAT OF THE ACIDS, CRYSTALLIZING TOLUIC ACIDS, AND WASHING THE CRYSTALLIZING ACIDS WITH A SATURATED LIQUID HYDROCARBON HAVING FROM 3 TO 8 CABRON ATOMS PER MOLECULE AT A TEMPERATURE NOT IN EXCESS OF ABOUT 50*C.
Claim 2
Dependent Claim
81 words
IN A METHOD FOR THE PURIFICATION OF TOLUIC ACIDS PREPARED BY THE LIQUID PHASE AIR OXIDATION OF XYLENES, THE STEPS COMPRISING SUBJECTING THE REACTION PRODUCT TO A DISFILLATION OPERATION TO REMOVE XYLENES AND OBTAIN TOLUIC ACIDS ADMIXED WITH NEUTRAL MATERIALS HAVING A BOILING RANGE CLOSE TO THAT OF THE ACIDS, CRYSTALLIZING TOLUIC ACIDS, AND WASHING THE CRYSTALLIZING ACIDS WITH A SATURATED LIQUID HYDROCARBON HAVING FROM 3 TO 8 CABRON ATOMS PER MOLECULE AT A TEMPERATURE NOT IN EXCESS OF ABOUT 50*C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |