The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1981
Filed:
Jan. 07, 1981
Applicant:
Inventor:
Edward L Derrenbacker, St. Louis, MO (US);
Assignee:
Mallinckrodt, Inc., St. Louis, MO (US);
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
564418 ; 564297 ;
Abstract
An improved process for preparing p-aminophenol by the catalytic hydrogenation of nitrobenzene in an aqueous acidic reaction medium containing a dimethylalkylamine oxide whereby the hydrogenation rate is increased and the selectivity of the reaction for p-aminophenol is improved.