US3296293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of carbocyclic dinitriles
Assignee: Eastman Kodak Co
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Filing: 1963-11-29
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Granted: 1967-01-03
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Expires: 1983-11-29
Abstract
No abstract record available.
Inventors
- 👤 Thomas H Strickland
- 👤 Charles J Kibler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:59
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE PROCESS OF PREPARING A CYCLOHEXANEDICARBONITRILE WHICH COMPRISES CONTACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE DIAMMONIUM SALTS, THE DIAMIDES AND THE DIESTERS OF 1,3- AND 1,4-CYCLOHEXANEDICARBOXYLIC ACID, IN THE PRESENCE OF AMMONIA, WITH A DEHYDRATION CATALYST AT A TEMPERATURE WITHIN THE RANGE OF 300-485*C., WHEREBY THE CORRESPONDING DICARBONITRILE OF THE ACID IS FORMED; SAID DIAMIDES AND SAID DIESTERS BEING VOLATILE UNDER ABOUT ONE ATMOSPHERE OF PRESSURE AT SAID TEMPERATURE.
Claim 2
Dependent Claim
72 words
THE PROCESS OF PREPARING A CYCLOHEXANEDICARBONITRILE WHICH COMPRISES CONTACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE DIAMMONIUM SALTS, THE DIAMIDES AND THE DIESTERS OF 1,3- AND 1,4-CYCLOHEXANEDICARBOXYLIC ACID, IN THE PRESENCE OF AMMONIA, WITH A DEHYDRATION CATALYST AT A TEMPERATURE WITHIN THE RANGE OF 300-485*C., WHEREBY THE CORRESPONDING DICARBONITRILE OF THE ACID IS FORMED; SAID DIAMIDES AND SAID DIESTERS BEING VOLATILE UNDER ABOUT ONE ATMOSPHERE OF PRESSURE AT SAID TEMPERATURE.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |