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:
Feb. 15, 1994
Filed:
Oct. 09, 1992
Applicant:
Inventors:
Jeffrey S Bolton, Wheeling, WV (US);
Robert L Mayen, New Martinsville, WV (US);
Assignee:
Miles, Inc., Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
521160 ; 521185 ; 560347 ; 560358 ; 560359 ; 564330 ; 564331 ; 564332 ; 564333 ; 564334 ;
Abstract
Disclosed herein is a process for preparing a reaction product containing methylene diphenylamine comprising reacting aniline with an aldehyde, in the presence of a low level of an acid wherein the acid level is reduced before digesting reaction mixture at a high temperature which is sufficient to effect a rearrangement of the intermediates to produce a reaction product containing methylene diphenylamines and low levels of impurities.
Bolton, Jeffrey. (1994). Process for reducing impurity levels in methylene diphenyamines (U.S. Patent No. 5286760). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5286760
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile