US2606926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing cyclohexane-diamines predominantly in the cis form
Assignee: EIDP Inc
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Filing: 1949-12-31
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Granted: 1952-08-12
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Expires: 1969-12-31
Abstract
No abstract record available.
Inventors
- 👤 James E Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:55
CPC Classifications
C; C07; C07C; C07C211/00; C07C211/33; C07C211/34; C07C211/36; C07C209/00; C07C209/44; C07C209/52; C07C209/68; C07C209/70; C07C209/82; C07C209/86; C07C211/35; C07C211/43; C07C211/44; C07C211/49; C07C211/50; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A PROCESS FOR THE PREPARATION OF CYCLOHEXANEDIAMINES PREDOMINANTLY IN THE CIS FORM, THE IMPROVEMENT WHICH COMPRISES REACTING, AS THE SOLE REACTANTS, IN CONTACT WITH A HYDROGENATION CATALYST CONTAINING RUTHENIUM AS THE ESSENTIAL CATALYTIC COMPONENT, HYDROGEN AT A TEMPERATURE OF 60 TO 125* C. UNDER A PRESSURE OF 30 TO 200 ATMOSPHERES AND AN ARYLENE COMPOUND OF 6 TO 7 CARBON ATOMS AND HAVING DIRECTLY CONNECTED TO THE ARYLENE RING A NITROGEN WHICH IS ATTACHED TO FROM ONE TO TWO ALKYL GROUPS EACH CONTAINING FROM ONE TO TWO FIVE CARBON ATOMS WITH ANY REMAINING VALENCE OF SAID NITROGEN BEING SATISFIED BY HYDROGEN, AND ALSO HAVING DIRECTLY CONNECTED TO SAID ARYLENE RING A MEMBER OF THE CLASS CONSISTING OF PRIMARY AMINO, NITRO AND NITROSO GROUPS, SAID RUTHENIUM HYDROGENATION CATALYST BEING PRESENT IN AMOUNT OF AT LEAST 0.5% OF THE WEIGHT OF THE AMINO COMPOUND HYDROGENATED.
Claim 2
Dependent Claim
144 words
IN A PROCESS FOR THE PREPARATION OF CYCLOHEXANEDIAMINES PREDOMINANTLY IN THE CIS FORM, THE IMPROVEMENT WHICH COMPRISES REACTING, AS THE SOLE REACTANTS, IN CONTACT WITH A HYDROGENATION CATALYST CONTAINING RUTHENIUM AS THE ESSENTIAL CATALYTIC COMPONENT, HYDROGEN AT A TEMPERATURE OF 60 TO 125* C. UNDER A PRESSURE OF 30 TO 200 ATMOSPHERES AND AN ARYLENE COMPOUND OF 6 TO 7 CARBON ATOMS AND HAVING DIRECTLY CONNECTED TO THE ARYLENE RING A NITROGEN WHICH IS ATTACHED TO FROM ONE TO TWO ALKYL GROUPS EACH CONTAINING FROM ONE TO TWO FIVE CARBON ATOMS WITH ANY REMAINING VALENCE OF SAID NITROGEN BEING SATISFIED BY HYDROGEN, AND ALSO HAVING DIRECTLY CONNECTED TO SAID ARYLENE RING A MEMBER OF THE CLASS CONSISTING OF PRIMARY AMINO, NITRO AND NITROSO GROUPS, SAID RUTHENIUM HYDROGENATION CATALYST BEING PRESENT IN AMOUNT OF AT LEAST 0.5% OF THE WEIGHT OF THE AMINO COMPOUND HYDROGENATED.
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) | 1955-08-12 | 1956-02-11 | 1956-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-12 | 1960-02-11 | 1960-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-12 | 1964-02-11 | 1964-08-12 | $7700.00 | Window Closed / Lapsed |