US2964553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of nitriles
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1957-09-30
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Granted: 1960-12-13
•
Expires: 1977-09-30
Abstract
No abstract record available.
Inventors
- 👤 Duxbury Frederick Keith
- 👤 Edgar Owen Burchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:59
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR THE MANUFACTURE OF A LOWER ALKYL ESTER OF AN W-CYANO UNSUBSTITUTED SATURATED ALIPHATIC CARBOXYLIC ACID, SAID ACID CONTAINING FROM 6 TO 10 CARBON ATOMS WHICH COMPRISES HEATING FOR A TIME NOT GREATER THAN ABOUT 20 SECONDS, A LOWER ALKYL HALF-ESTER OF AN UNSUBSTITUTED SATURATED ALIPHATIC DICARBOXYLIC ACID, SAID ACID CONTAINING FROM 6 TO 10 CARBON ATOMS, WITH AMMONIA IN THE PRESENCE OF A DEHYDRATING CATALYST, SAID REACTION BEING CARRIED OUT IN THE VAPOR PHASE USING FROM ABOUT 3 TO 10 MOLES OF AMMONIA FOR EACH MOLE OF HALF-ESTER.
Claim 2
Dependent Claim
91 words
A PROCESS FOR THE MANUFACTURE OF A LOWER ALKYL ESTER OF AN W-CYANO UNSUBSTITUTED SATURATED ALIPHATIC CARBOXYLIC ACID, SAID ACID CONTAINING FROM 6 TO 10 CARBON ATOMS WHICH COMPRISES HEATING FOR A TIME NOT GREATER THAN ABOUT 20 SECONDS, A LOWER ALKYL HALF-ESTER OF AN UNSUBSTITUTED SATURATED ALIPHATIC DICARBOXYLIC ACID, SAID ACID CONTAINING FROM 6 TO 10 CARBON ATOMS, WITH AMMONIA IN THE PRESENCE OF A DEHYDRATING CATALYST, SAID REACTION BEING CARRIED OUT IN THE VAPOR PHASE USING FROM ABOUT 3 TO 10 MOLES OF AMMONIA FOR EACH MOLE OF HALF-ESTER.
References Cited (Backward Citations)
GB568941A
Cited
US2590986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |