Patent US3616320A successfully refreshed from Google Patents.
US3616320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of adiponitrile
Assignee: BASF SE
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Filing: 1969-03-17
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Granted: 1971-10-26
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Expires: 1989-03-17
Abstract
Abstract Production of adiponitrile by direct electrochemical hydrodimerization of acrylonitrile in a medium which contains acrylonitrile, and electrolyte salt, water and, if desired, a solvent at a temperature of from 10* to 60* C. and a pH value of from 1 to 10 using liquid-impermeable electrodes. The medium is passed through the pairs of electrodes which are 0.05 to 2 mm. apart. Adiponitrile is an important intermediate for synthetic fiber manufacture.
Inventors
- 👤 Fritz Beck
- 👤 Hans Leitner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:31
CPC Classifications
C; C25; C25B; C25B3/00; C25B3/20; C25B3/29; C25B3/295; C25B3/01; C25B3/09
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
18 words
A process as in claim 1 wherein the electrodes of each pair are separated by a liquid-permeable insulator.
Claim 2
Dependent Claim
15 words
A process as in claim 1 wherein a plurality of pairs of electrodes is used.
Claim 3
Dependent Claim
23 words
A process as in claim 1 wherein in each electrode pair the anode consists of lead dioxide and the cathode consists of graphite.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |