US2947781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction process for preparing aromatic p-amino compounds
Assignee: EIDP Inc
•
Filing: 1953-06-10
•
Granted: 1960-08-02
•
Expires: 1973-06-10
Abstract
No abstract record available.
Inventors
- 👤 Spiegler Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:15
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE PROCESS OF PREPARING AN AMINO COMPOUND TAKEN FROM THE GROUP CONSISTING OF P-AMINOPHENOL AND P-AMINOBENZOIC ACID BY CATALYTIC HYDROGENATION OF THE CORRESPONDING STARTING NITRO COMPOUND WHICH COMPRISES ADDING HYDROGEN GAS TO SUSPENSION CONSISTING OF THE NITRO COMPOUND TO BE REDUCED, WATER, AND CATALYST, AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE WITHIN THE RANGE OF 50-95*C., SAID CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF PLATINUM AND PALLADIUM AND THEIR OXIDES, AND, SAID CATALYST BEING PRESENT IN SAID SUSPENSION AT A CONCENTRATION OF AT LEAST 0.025* BASED ON THE WEIGHT OF SAID STARTING NITRO COMPOUND.
Claim 2
Dependent Claim
95 words
THE PROCESS OF PREPARING AN AMINO COMPOUND TAKEN FROM THE GROUP CONSISTING OF P-AMINOPHENOL AND P-AMINOBENZOIC ACID BY CATALYTIC HYDROGENATION OF THE CORRESPONDING STARTING NITRO COMPOUND WHICH COMPRISES ADDING HYDROGEN GAS TO SUSPENSION CONSISTING OF THE NITRO COMPOUND TO BE REDUCED, WATER, AND CATALYST, AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE WITHIN THE RANGE OF 50-95*C., SAID CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF PLATINUM AND PALLADIUM AND THEIR OXIDES, AND, SAID CATALYST BEING PRESENT IN SAID SUSPENSION AT A CONCENTRATION OF AT LEAST 0.025* BASED ON THE WEIGHT OF SAID STARTING NITRO COMPOUND.
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) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |