US3661894A
Expired / Lapsed
US
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Method of producing n-alkyl lactams
Assignee: Leuna Werke GmbH
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Filing: 1970-06-29
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Granted: 1972-05-09
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Expires: 1990-06-29
Abstract
Abstract METHOD OF PRODUCING A N-ALKYL SUBSTITUTED LACTAM, COMPRISING CONTACTING A N-SUBSTITUTED LACTAM WITH A SYMMETRICAL DIALKYL ETHER AT A TEMPERATURE OF 200 TO 400*C. IN THE PRESENCE OF A CATALYST WHICH CATALYZES THE SPLITTING OFF OF WATER.
Inventors
- 👤 Klaus Wehner
- 👤 Werner Kisan
- 👤 Gerald Kunz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:38
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/267
Claims Analysis
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |