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:
Jun. 12, 1984
Filed:
Oct. 13, 1982
Applicant:
Inventors:
John E Aiken, Allegheny County, PA (US);
Marvin C Fields, Allegheny County, PA (US);
Robert M Stickel, Municipality of Murrysville, Westmoreland County, PA (US);
Assignee:
United States Steel Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
564435 ;
Abstract
Diphenylamine is made by the reaction in the vapor phase of two moles of aniline with the consequent evolution of ammonia; surprisingly high yields and selectivities are obtained by maintaining a significant concentration of ammonia in the catalyst zone, preferably by using the ammonia as a carrier for the aniline.