US2846462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing isophthalonitrile and terephthalonitrile
Assignee: Distillers Co Yeast Ltd
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Filing: 1956-11-29
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Granted: 1958-08-05
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Expires: 1976-11-29
Abstract
No abstract record available.
Inventors
- 👤 Hadley David James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:03
CPC Classifications
C; C07; C07C; C07C255/00; C07C253/00; C07C253/24; C07C253/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE PROCESS FOR THE PRODUCTION OF ISOPHTHALONITRILE AND TEREPHTHALONITRILE WHICH COMPRISES CONTACTING AT AN ELEVATED TEMPERATURE A MIXTURE IN THE VAPOR PHASE OF META-XYLENE, PARAXYLENE, AMMONIA AND MOLECULAR OXYGEN WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF VANADIUM OXIDE AND MOLYBDENUM OXIDE TO PRODUCE A MIXTURE CONTAINING ISOPHTHALONITRILE AND TEREPHTHALONITRILE, AND TREATING THE MIXTURE OF NITRILES WITH AN ORGANIC SOLVENT IN WHICH ONE OF THE NITRILES IS MORE SOLUBLE BEING THE OTHER TO ISOLATE ONE OF THE NITRILES, SAID SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ISOPROPANOL, ETHYL ACETATE, GLACIAL ACETIC ACID, AQUEOUS SOLUTIONS OF GLACIAL ACETIC ACID, BENZENE, AND XYLENE.
Claim 2
Dependent Claim
105 words
THE PROCESS FOR THE PRODUCTION OF ISOPHTHALONITRILE AND TEREPHTHALONITRILE WHICH COMPRISES CONTACTING AT AN ELEVATED TEMPERATURE A MIXTURE IN THE VAPOR PHASE OF META-XYLENE, PARAXYLENE, AMMONIA AND MOLECULAR OXYGEN WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF VANADIUM OXIDE AND MOLYBDENUM OXIDE TO PRODUCE A MIXTURE CONTAINING ISOPHTHALONITRILE AND TEREPHTHALONITRILE, AND TREATING THE MIXTURE OF NITRILES WITH AN ORGANIC SOLVENT IN WHICH ONE OF THE NITRILES IS MORE SOLUBLE BEING THE OTHER TO ISOLATE ONE OF THE NITRILES, SAID SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, ISOPROPANOL, ETHYL ACETATE, GLACIAL ACETIC ACID, AQUEOUS SOLUTIONS OF GLACIAL ACETIC ACID, BENZENE, AND XYLENE.
References Cited (Backward Citations)
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US2450639A
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US2499055A
Cited
US2487298A
Cited
US2744925A
Cited
US2741633A
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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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |