US3755449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing aminodiphenyl ether derivatives
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1969-02-25
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Granted: 1973-08-28
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Expires: 1989-02-25
Abstract
Abstract PROCESS FOR CATALYTIC REDUCTION OF A NITRODIPHENYL ETHER DERIVATIVE TO PRODUCE AN AMINODIPHENYL ETHER DERIVATIVE WHICH COMPRISES TREATING THE NITRODIPHENYL EITHER DERIVATIVE WITH HYDROGEN IN THE PRESENCE OF RANEY NICKEL IN DIMETHYLFORMAMIDE AT A TEMPERATURE OF 50 TO 200*C. UNDER A PRESSURE OF 5 TO 150 KG./CM.2 FOR A PERIOD OF 1 TO 20 HOURS.
Inventors
- 👤 K Ito
- 👤 H Kaminaka
- 👤 T Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:10
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/02
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |