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:
Sep. 12, 1978
Filed:
Apr. 01, 1977
Applicant:
Inventors:
Helmut AUS DER Funten, Niederkassel, DE;
Wilhelm Vogt, Cologne, DE;
Assignee:
Dynamit Nobel Aktiengesellschaft, Cologne, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603 / ;
Abstract
Method for preparing phthalide by the catalytic dehalogenation of 3-chlorophthalide in the presence of hydrogenation catalyst and in the presence of an HCl acceptor. The phathalide which is produced is a valuable chemical intermediate for the manufacture of dyes, plant protecting agents and pharmaceuticals.