Patent US3232989A successfully refreshed from Google Patents.
US3232989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic dinitro compounds
Assignee: GAF Chemicals Corp
•
Filing: 1964-12-22
•
Granted: 1966-02-01
•
Expires: 1984-12-22
Abstract
No abstract record available.
Inventors
- 👤 David E Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:10
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
IN A PROCESS FOR THE CATALYTIC HYDROGEN REDUCTION OF AROMATIC DINITRO COMPOUNDS TO FORM THE CORRESPONDING DIAMINE COMPOUNDS, WHEREIN A SOLUTION OF THE DINITRO COMPOUND TO BE REDUCED IN AN INERT SLVENT WHILE AGITATED IS REACTED WITH HYDROGEN AT A TEMPERATURE OF 40-100*C. AND A PRESSURE OF FROM ATMOSPHERIC TO 150 P.S.I.G. IN A HYDROGENATION ZONE IN THE PRESENCE OF A HYDROGENATION CATALYST SELECTED FROM THE GROUP CONSISTING OF NICKEL AND THE PLATINUM METALS, THE IMPROVEMENT OF FIRST HYDROGENATING THE DINITRO COMPOUND TO BE REDUCED UNTIL A MINOR AMOUNT FROM ABOUT 1% UP TO ABOUT 10% BY WEIGHT OF THEORY OF THE HYDROGEN REQUIRED FOR COMPLETE REDUCTION OF SAID DINITRO COMPOUND HAS BEEN ABSORBED, THEREAFTER REMOVING THE CATALYST FROM THE DINITRO MATERIAL BEING HYDROGENATED, ADDING FRESH CATALYST TO THE THUS TREATED DINITRO MATERIAL AND THEN CONTINUING SAID HYDROGENATION OF THE THUS TREATED DINITRO MATERIAL IN THE ABSENCE OF ANY UNTREATED DINITRO MATERIAL.
Claim 2
Dependent Claim
152 words
IN A PROCESS FOR THE CATALYTIC HYDROGEN REDUCTION OF AROMATIC DINITRO COMPOUNDS TO FORM THE CORRESPONDING DIAMINE COMPOUNDS, WHEREIN A SOLUTION OF THE DINITRO COMPOUND TO BE REDUCED IN AN INERT SLVENT WHILE AGITATED IS REACTED WITH HYDROGEN AT A TEMPERATURE OF 40-100*C. AND A PRESSURE OF FROM ATMOSPHERIC TO 150 P.S.I.G. IN A HYDROGENATION ZONE IN THE PRESENCE OF A HYDROGENATION CATALYST SELECTED FROM THE GROUP CONSISTING OF NICKEL AND THE PLATINUM METALS, THE IMPROVEMENT OF FIRST HYDROGENATING THE DINITRO COMPOUND TO BE REDUCED UNTIL A MINOR AMOUNT FROM ABOUT 1% UP TO ABOUT 10% BY WEIGHT OF THEORY OF THE HYDROGEN REQUIRED FOR COMPLETE REDUCTION OF SAID DINITRO COMPOUND HAS BEEN ABSORBED, THEREAFTER REMOVING THE CATALYST FROM THE DINITRO MATERIAL BEING HYDROGENATED, ADDING FRESH CATALYST TO THE THUS TREATED DINITRO MATERIAL AND THEN CONTINUING SAID HYDROGENATION OF THE THUS TREATED DINITRO MATERIAL IN THE ABSENCE OF ANY UNTREATED DINITRO MATERIAL.
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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |