US3666813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing aromatic haloamines from aromatic nitroamines
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1969-08-27
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Granted: 1972-05-30
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Expires: 1989-08-27
Abstract
Abstract Process for preparing aromatic haloamines comprises hydrogenating the corresponding halogen-substituted nitroaromatic compound in the presence of a platinum group metal catalyst, said catalyst being modified with a metal selected from the group Pb, Bi, or Ag. The catalysts are effective at relatively mild conditions and the hydrogenation is effected with minimum dehalogenation.
Inventors
- 👤 Saul G Hindin
- 👤 Daniel L Bair
- 👤 Duane R Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:37
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/644; B01J23/6447; B01J23/48; B01J23/50; B01J23/62; B01J23/622; B01J23/628; C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36; C07C209/365
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
11 words
The process of claim 1 wherein said solid carrier is carbon.
Claim 2
Dependent Claim
17 words
The process of claim 2 wherein said first metal is platinum and said modifying metal is lead.
Claim 3
Dependent Claim
17 words
The process of claim 2 wherein said first metal is palladium and said modifying metal is lead.
Claim 4
Dependent Claim
17 words
The process of claim 2 wherein said first metal is platinum and said modifying metal is bismuth.
Claim 5
Dependent Claim
17 words
The process of claim 2 wherein said first metal is platinum and said modifying metal is silver.
References Cited (Backward Citations)
US3253039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |