US2668175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of acrylonitrile
Assignee: BASF SE
•
Filing: 1951-12-29
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Granted: 1954-02-02
•
Expires: 1971-12-29
Abstract
No abstract record available.
Inventors
- 👤 Reppe Walter
- 👤 Nikolaus V Kutepow
- 👤 Leichtle Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:10
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
A PROCESS FOR THE PRODUCTION OF ACRYLONITRILE WHICH COMPRISES LEADING ACRYLIC ACID AND AMMONIA IN THE GAS PHASE AT A TEMPERATURE ABOVE 200* C. OVER A WATER-REMOVING CATALYST CONTAINING A COMPOUND SELECTED FROM THE CLASS CONSISTING OF PHOSPHORIC ACID AND A PHOSPHATE, THE ACRYLIC ACID AND AMMONIA BEING SEPARATELY PREHEATED AT A TEMPERATURE ABOVE 200* C. BEFORE BRINGING THEM TOGETHER IN CONTACT WITH THE CATALYST.
References Cited (Backward Citations)
US2132849A
Cited
US2373190A
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US2334192A
Cited
US2375005A
Cited
US2417749A
Cited
US2481826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |