Patent US3056355A successfully refreshed from Google Patents.
Patent US2770641A successfully refreshed from Google Patents.
US2770641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of benzonitrile
Assignee: Rohm and Haas Co
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Filing: 1954-08-13
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Granted: 1956-11-13
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Expires: 1974-08-13
Abstract
No abstract record available.
Inventors
- 👤 Charles H Mckeever
- 👤 Joseph W Nemec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:37
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS FOR PREPARING BENZONITRILE WHICH COMPRISES CHARGING TO A REACTION ZONE IN A REACTION SYSTEM BENZONITRILE IN AN AMOUNT TO FILL A FRACTION OF SAID ZONE SUPPLYING TO SAID ZONE A DEHYDRATION CATALYST, HEATING THE CHARGED BENZONITRILE UNTIL VAPORS THEREOF PASS THROUGH A FRACTIONATING ZONE TO A CONDENSING ZONE WHERE THE VAPORS ARE CONDENSED WITH REFLUX OF BENZONITRILE, PASSING INTO THE REACTION ZONE BENZOIC ACID AND AMMONIA IN MLECULAR EXCESS OF THE SAID ACID WHILE MAINTAINING REFLUX OF THE BENZONITRILE, HEATING THE REACTION ZONE UNTIL THE CONTENTS THEREOF ARE BETWEEN 200* AND 250* C. AND THE VAPOR TEMPERATURES AT THE HEAD OF THE FRACTIONATING ZONE ARE MAINTAINED BETWEEN 125* AND 175* C. WHILE ADDITION OF BENZOIC ACID AND AMMONIA IS CONTINUED, TAKING OFF BENZONITRILE AND WATER WHILE MAINTAINING REFLUX OF BENZONITRILE AND WATER.
Claim 2
Dependent Claim
134 words
A PROCESS FOR PREPARING BENZONITRILE WHICH COMPRISES CHARGING TO A REACTION ZONE IN A REACTION SYSTEM BENZONITRILE IN AN AMOUNT TO FILL A FRACTION OF SAID ZONE SUPPLYING TO SAID ZONE A DEHYDRATION CATALYST, HEATING THE CHARGED BENZONITRILE UNTIL VAPORS THEREOF PASS THROUGH A FRACTIONATING ZONE TO A CONDENSING ZONE WHERE THE VAPORS ARE CONDENSED WITH REFLUX OF BENZONITRILE, PASSING INTO THE REACTION ZONE BENZOIC ACID AND AMMONIA IN MLECULAR EXCESS OF THE SAID ACID WHILE MAINTAINING REFLUX OF THE BENZONITRILE, HEATING THE REACTION ZONE UNTIL THE CONTENTS THEREOF ARE BETWEEN 200* AND 250* C. AND THE VAPOR TEMPERATURES AT THE HEAD OF THE FRACTIONATING ZONE ARE MAINTAINED BETWEEN 125* AND 175* C. WHILE ADDITION OF BENZOIC ACID AND AMMONIA IS CONTINUED, TAKING OFF BENZONITRILE AND WATER WHILE MAINTAINING REFLUX OF BENZONITRILE AND WATER.
References Cited (Backward Citations)
US2100401A
Cited
US2591493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-13 | 1960-05-14 | 1960-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-13 | 1964-05-14 | 1964-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-13 | 1968-05-14 | 1968-11-13 | $7700.00 | Window Closed / Lapsed |