US3347900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing unsaturated nitriles
Assignee: Hoechst AG
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Filing: 1965-04-21
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Granted: 1967-10-17
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Expires: 1985-04-21
Abstract
No abstract record available.
Inventors
- 👤 Gossel Helmut
- 👤 Wirtz Rudolf
- 👤 Fernholz Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:45
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/08; C07C253/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR PREPARING ACRYLONITRILE WHICH COMPRISES REACTING ETHYLENE WITH HYDROGEN CYANIDE AND OXYGEN AT A TEMPERATURE OF 0 TO 200*C. AND A PRESSURE OF 2 TO 300 ATMOSPHERES IN THE PRESENCE OF A NOBLE METAL AS CATALYST.
Claim 2
Dependent Claim
38 words
A PROCESS FOR PREPARING ACRYLONITRILE WHICH COMPRISES REACTING ETHYLENE WITH HYDROGEN CYANIDE AND OXYGEN AT A TEMPERATURE OF 0 TO 200*C. AND A PRESSURE OF 2 TO 300 ATMOSPHERES IN THE PRESENCE OF A NOBLE METAL AS CATALYST.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |