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:
Mar. 10, 1981
Filed:
Dec. 20, 1978
Applicant:
Inventor:
Werner H Muller, Eppstein/Taunus, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
544239 ; 544240 ; 544241 ;
Abstract
Pyridazones are prepared by heating 4,5-dihydro-3-pyridazones in the liquid phase in the presence of a dehydrogenation catalyst. The reaction temperature is in the range of from 150.degree. to 350.degree. C. The dehydrogenation catalyst contains a noble metal of subgroup 8 of the periodic table, which is generally supported on a carrier. The reaction is preferably carried out in the presence of a solvent.