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:
Jan. 02, 1990
Filed:
Jul. 12, 1988
Applicant:
Inventors:
Assignee:
Huels Troisdorf AG, Cologne, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
556 54 ;
Abstract
Disclosed are very pure zirconium and hafnium orthoesters and a method for their preparation. In this method the reaction between the halides of these metals and the alcohols is performed in the presence of hydrocarbons or chlorinated hydrocarbons, and the alcohol is not use in excess. The obtained orthoesters are in very pure form and not as addition products with alcohol. They can be isolated as solids.
Horns, Udo. (1990). Alcohol-free orthoesters of zirconium and hafnium and method for the (U.S. Patent No. 4891439). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4891439
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