Patent US2132481A successfully refreshed from Google Patents.
US2606928A
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Preparation of amino alicyclic compounds
Assignee: EIDP Inc
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Filing: 1947-11-18
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Granted: 1952-08-12
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Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 Archie E Barkdoll
- 👤 Elbridge R Graef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:33
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/68; C07C209/70; C07C209/72; C07C211/00; C07C211/33; C07C211/34; C07C211/36; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
IN A PROCESS FOR PREPARING DI-(P-AMINOCYCLOHEXY) METHANE WHICH COMPRISES HYDROGENATING DI-(P-AMINOPHENYL) METHANE AT SUPERATMOSPHERIC PRESSURE IN THE PRESENCE OF A RUTHENIUM DIOXIDE CATALYST AND IN THE PRESENCE OF AT LEAST SIX MOLS OF HYDROGEN PER MOL OF DI(P-AMINOPHENYL) METHANE, THE IMPROVEMENT WHICH COMPRISES PASSING THE DI-(P-AMINOPHENYL) METHANE CONTINUOUSLY OVER THE CATALYST AT A SPACE VELOCITY OF FROM 0.1 TO 0.6 VOLUME OF DI-(P-AMINOPHENYL) METHANE PER VOLUME OF CATALYST PER HOUR AND MAINTAINING THE REACTION TEMPERATURE WITHIN THE RANGE OF 130* TO 180* C.
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 |