US3609169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 3,9-bis-(aminoalkyl)-2,4,8,10-tetroxaspiro {8 5,5{9 undecan
Assignee: Ajinomoto Co Inc
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Filing: 1968-05-08
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Granted: 1971-09-28
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Expires: 1988-05-08
Abstract
Abstract The yield of 3,9-bis(aminoalkyl)-2,4,8,10-tetroxaspiro (5,5) undecanes from the catalytic hydrogenation of the corresponding 3,9-bis(cyanoalkyl)-2,4,8,10-tetroxaspiro (5,5) undecanes is increased over known methods, and the recovery of the product from the hydrogenation mixture is facilitated if the dinitrile is hydrogenated in the molten condition in the presence of ammonia and a Raney cobalt or nickel formate catalyst in the absence of a solvent or diluent.
Inventors
- 👤 Kazumi Iijima
- 👤 Yoshioki Komachiya
- 👤 Eiji Negoro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:33
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
In a method as set forth in claim 1, said dinitrile constituting a continuous phase in said vessel, said catalyst being dispersed in said molten dinitrile.
Claim 2
Dependent Claim
27 words
In a method as set forth in claim 2, said catalyst being dispersed in said continuous phase in an amount of 0.5 to 10 percent by weight.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |