Patent US2608582A successfully refreshed from Google Patents.
US2608582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of p-acetylaminobenzaldehyde
Assignee: GAF Chemicals Corp
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Filing: 1950-06-09
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Granted: 1952-08-26
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Expires: 1970-06-09
Abstract
No abstract record available.
Inventors
- 👤 William G Huey
- 👤 Bernard W Rottschaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:38
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS OF PRODUCING P-ACETYLAMINOBENZALDEHYDE WHICH COMPRISES HEATING P-NITROTOLUENE IN AN AQUEOUS ALCOHOLIC MEDIUM WITH ALKALINE ALKALI METAL POLYSULFIDE SOLUTION TO EFFECT SIMULTANEOUS OXIDATION AND REDUCTION OF THE PNITROTOLUENE TO P-AMINOBENZALDEHYDE, DISTILLING THE ALCOHOL AND PROMPTLY ACETYLATING THE PAMINOBENZALDEHYDE WHILE DISSOLVED IN THE PTOLUIDINE PRODUCED AS A BY-PRODUCT IN THE OXIDATION-REDUCTION REACTION BY HEATING THE SAME WITH ACETIC ANHYDRIDE AT A TEMPERATURE RANGING FROM 60 TO 100* C.
Claim 2
Dependent Claim
68 words
THE PROCESS OF PRODUCING P-ACETYLAMINOBENZALDEHYDE WHICH COMPRISES HEATING P-NITROTOLUENE IN AN AQUEOUS ALCOHOLIC MEDIUM WITH ALKALINE ALKALI METAL POLYSULFIDE SOLUTION TO EFFECT SIMULTANEOUS OXIDATION AND REDUCTION OF THE PNITROTOLUENE TO P-AMINOBENZALDEHYDE, DISTILLING THE ALCOHOL AND PROMPTLY ACETYLATING THE PAMINOBENZALDEHYDE WHILE DISSOLVED IN THE PTOLUIDINE PRODUCED AS A BY-PRODUCT IN THE OXIDATION-REDUCTION REACTION BY HEATING THE SAME WITH ACETIC ANHYDRIDE AT A TEMPERATURE RANGING FROM 60 TO 100* C.
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) | 1955-08-26 | 1956-02-25 | 1956-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-26 | 1960-02-25 | 1960-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-26 | 1964-02-25 | 1964-08-26 | $7700.00 | Window Closed / Lapsed |