US3567757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing omega-aminoalkanenitriles
Assignee: SHIN ICHI TAIRA
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Filing: 1968-02-02
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Granted: 1971-03-02
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Expires: 1988-02-02
Abstract
Abstract PROCESS FOR PREPARING OMEGA-AMINOALKANENITRILES WHICH COMPRISES DEHYDRATING THE CORRESPONDING LACTAMS IN THE PRESNECE OF AN EXCESS OF AMMONIA IN THE VAPOR PHASE WITH THE AID OF A DEHYDRATING CATALYST OBTAINED BY CALCINING AT 300-550*C. A METAL SALT OF PHOSPHORIC ACID, IN WHICH A METAL IS SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, CALCIUM, BARIUM, ZINC, CADMIUM AND ALUMINUM.
Inventors
- 👤 Kenzaburo Ida
- 👤 Seiya Suzuki
- 👤 Yasuo Iizuka
- 👤 Tsutomu Setsuda
- 👤 Shin-Ichi Taira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:41
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 0
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |