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:
Oct. 21, 1997
Filed:
Jan. 12, 1995
Applicant:
Inventors:
Claude Mercier, Knoll Hill, GB;
Graham Vaughan Scott, Chew-Magna, GB;
Assignee:
Rhone-Poulenc Chemicals Limited, Hertfordshire, GB;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
585469 ; 585408 ;
Abstract
Substituted aromatic hydrocarbons, e.g. 1,3-difluorobenzene, are produced by dediazoniation of the corresponding aromatic primary amines by converting them into a corresponding diazonium salt in the presence of hypophosphorous acid and a metal catalyst so that the diazonium group is replaced by hydrogen as it is formed.