US2847462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fractionating mixed isomers of trichlorobenzoic acid
Assignee: Heyden Newport Chemical Corp
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Filing: 1956-03-02
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Granted: 1958-08-12
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Expires: 1976-03-02
Abstract
No abstract record available.
Inventors
- 👤 George M Sieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:17
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE PROCESS OF FRACTIONATING A MIXTURE OF ISOMERS OF TRICHLOROBENZOIC ACID STARTING MATERIAL CONTAINING THE 2,3,6-ISOMER AND ANOTHER ISOMER, THE IMPROVEMENT COMPRISING TREATING THE MIXTURE OF ISOMERS WITH AN ALKYL ACETATE IN WHICH THE ALKYL GROUP CONTAINS 1-5 CARBON ATOMS AND FORMING A MIXTURE OF AN ALKYL ACETATE SOLUTION OF TRICHLOROBENZOIC ACID CONTAINING A HIGHER PERCENTAGE BY WEIGHT OF THE 2,3,6-ISOMER THAN THE TRICHLOROBENZOIC ACID STARTING MATERIAL AND AN UNDISSOLVED PORTION CONTAINING A LOWER PERCENTAGE BY WEIGHT THAN THE TRICHLOROBENZOIC ACID STARTING MATERIAL, AND SEPARATING THE ALKYL ACETATE SOLUTION FROM THE UNDISSOLVED TRICHLOROBENZOIC ACID.
Claim 2
Dependent Claim
95 words
IN THE PROCESS OF FRACTIONATING A MIXTURE OF ISOMERS OF TRICHLOROBENZOIC ACID STARTING MATERIAL CONTAINING THE 2,3,6-ISOMER AND ANOTHER ISOMER, THE IMPROVEMENT COMPRISING TREATING THE MIXTURE OF ISOMERS WITH AN ALKYL ACETATE IN WHICH THE ALKYL GROUP CONTAINS 1-5 CARBON ATOMS AND FORMING A MIXTURE OF AN ALKYL ACETATE SOLUTION OF TRICHLOROBENZOIC ACID CONTAINING A HIGHER PERCENTAGE BY WEIGHT OF THE 2,3,6-ISOMER THAN THE TRICHLOROBENZOIC ACID STARTING MATERIAL AND AN UNDISSOLVED PORTION CONTAINING A LOWER PERCENTAGE BY WEIGHT THAN THE TRICHLOROBENZOIC ACID STARTING MATERIAL, AND SEPARATING THE ALKYL ACETATE SOLUTION FROM THE UNDISSOLVED TRICHLOROBENZOIC ACID.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |