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Patent US2976320A successfully refreshed from Google Patents.
US2976320A
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Catalytic hydrogenation of the dinitro derivatives of toluene
Assignee: Honeywell International Inc
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Filing: 1957-07-30
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Granted: 1961-03-21
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Expires: 1977-07-30
Abstract
No abstract record available.
Inventors
- 👤 Leon O Winstrom
- 👤 Roger D Samdahl
- 👤 Philip S Perch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:36
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE IMPROVEMENT IN THE METHOD OF REDUCING DINITROTOLUENE TO THE CORRESPONDING DIAMINE BY CATALYTIC HYDROGENATION, WHICH COMPRISES CARRYING OUT THE HYDROGENATION WITH THE DINITROTOLUENE IN THE MOLTEN FORM AS THE REACTION MEDIUM AND CONTAINING NOT MORE THAN 500 P.P.M. OF NITROPHENOLS.
Claim 2
Dependent Claim
41 words
THE IMPROVEMENT IN THE METHOD OF REDUCING DINITROTOLUENE TO THE CORRESPONDING DIAMINE BY CATALYTIC HYDROGENATION, WHICH COMPRISES CARRYING OUT THE HYDROGENATION WITH THE DINITROTOLUENE IN THE MOLTEN FORM AS THE REACTION MEDIUM AND CONTAINING NOT MORE THAN 500 P.P.M. OF NITROPHENOLS.
References Cited (Backward Citations)
CA476666A
Cited
CA508597A
Cited
GB191416936A
Cited
FR559732A
Cited
US1849428A
Cited
US2131734A
Cited
US2526913A
Cited
US2619503A
Cited
US2823235A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |