Patent US2955130A successfully refreshed from Google Patents.
US2955130A
Expired / Lapsed
US
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Preparation of gas mixtures suitable for the manufacture of nitriles
Assignee: Lonza Electric and Chemical Works Ltd
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Filing: 1957-06-28
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Granted: 1960-10-04
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Expires: 1977-06-28
Abstract
No abstract record available.
Inventors
- 👤 Guyer August
- 👤 Richarz Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:13
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A METHOD OF PREPARING ADIPONITRILE COMPRISING PASSING A FILM OF LIQUID ADIPIC ACID OVER A HEATED METALLIC SURFACE, HEATING SAID FILM TO A TEMPERATURE OF ABOUT 280290*C., PASSING AMMONIA OVER SAID FILM, SAID AMMONIA HAVING A TEMPERATURE OF ABOUT 280-380*C. AND BEING EMPLOYED IN AN AMOUNT IN EXCESS OF THE AMOUNT STOICHIOMETRICALLY REQUIRED FOR THE FORMATION OF ADIPONITRILE, WITHDRAWING THE THUS OBTAINED AMMONIA-ADIPIC ACID VAPOR MIXTURE, AND REACTING SAID MIXTURE TO FORM ADIPONITRILE.
Claim 2
Independent Claim
73 words
A METHOD OF PREPARING ADIPONITRILE COMPRISING PASSING A FILM OF LIQUID ADIPIC ACID OVER A HEATED METALLIC SURFACE, HEATING SAID FILM TO A TEMPERATURE OF ABOUT 280290*C., PASSING AMMONIA OVER SAID FILM, SAID AMMONIA HAVING A TEMPERATURE OF ABOUT 280-380*C. AND BEING EMPLOYED IN AN AMOUNT IN EXCESS OF THE AMOUNT STOICHIOMETRICALLY REQUIRED FOR THE FORMATION OF ADIPONITRILE, WITHDRAWING THE THUS OBTAINED AMMONIA-ADIPIC ACID VAPOR MIXTURE, AND REACTING SAID MIXTURE TO FORM ADIPONITRILE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |