Patents by Inventor Hans-Joachim Yahlensieck

Hans-Joachim Yahlensieck has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Alcohol-free orthoesters of zirconium and hafnium and method for the preparation thereof
    Patent number: 4891439
    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.
    Type: Grant
    Filed: July 12, 1988
    Date of Patent: January 2, 1990
    Assignee: Huels Troisdorf AG
    Inventors: Udo Horns, Hans-Gunther Srebny, Hans-Joachim Yahlensieck