US2501825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of certain alpha, alpha-disubstituted, beta-nitro propionic acid compounds
Assignee: Celanese Corp
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Filing: 1947-05-15
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Granted: 1950-03-28
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Expires: 1967-05-15
Abstract
No abstract record available.
Inventors
- 👤 Lincoln James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:23
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; C07D233/76; C07D233/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
PROCESS FOR THE MANUFACTURE OF ALPHA-ALPHADISUBSTITUTED-BETA-AMINO-PROPIONIC ACIDS SELECTED FROM THE GROUP CONSISTING OF BETA-AMINO-ALPHAPHENYL HYDROTROPIC ACID AND AMINO-PIVALIC ACID, WHICH COMPRISES HYDROGENATING A COMPOUND SELECTED FROM THE GROUP WHICH CONSISTS OF ALKALI METALS SALTS AND ALKALINE EARTH SALTS OF BETANITRO-ALPHA-PHENYL HYDROTROPIC ACID AND NITROPIVALIC ACID IN AN AQUEOUS MEDIUM CONTAINING RANEY NICKEL AS HYDROGENATION CAYALYST AT ABOUT 90 TO 100*C., AND CONVERTING THE PRODUCT INTO THE FREE ACID BY THE ACTION OF A MINERAL ACID.
Claim 2
Dependent Claim
75 words
PROCESS FOR THE MANUFACTURE OF ALPHA-ALPHADISUBSTITUTED-BETA-AMINO-PROPIONIC ACIDS SELECTED FROM THE GROUP CONSISTING OF BETA-AMINO-ALPHAPHENYL HYDROTROPIC ACID AND AMINO-PIVALIC ACID, WHICH COMPRISES HYDROGENATING A COMPOUND SELECTED FROM THE GROUP WHICH CONSISTS OF ALKALI METALS SALTS AND ALKALINE EARTH SALTS OF BETANITRO-ALPHA-PHENYL HYDROTROPIC ACID AND NITROPIVALIC ACID IN AN AQUEOUS MEDIUM CONTAINING RANEY NICKEL AS HYDROGENATION CAYALYST AT ABOUT 90 TO 100*C., AND CONVERTING THE PRODUCT INTO THE FREE ACID BY THE ACTION OF A MINERAL ACID.
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) | 1953-03-27 | 1953-09-26 | 1954-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-27 | 1957-09-26 | 1958-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-27 | 1961-09-26 | 1962-03-28 | $7700.00 | Window Closed / Lapsed |