Patents by Inventor Wolfgang R. Langhauser

Wolfgang R. Langhauser 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).

  • Process for the production of linear polyesters
    Patent number: 3998793
    Abstract: An alkali metal hydrogen monoglycolphosphate is added to the reaction product of diethylene glycol and dimethyl terephthalate to arrest the ester-interchange reaction and nullify the action of the divalent metal salt catalyst. These phosphates are easy to handle and convert the catalyst to an inactive compound which does not adversely affect subsequent polycondensation of the diethylene glycol terephthalate.
    Type: Grant
    Filed: March 6, 1975
    Date of Patent: December 21, 1976
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Werner Gey, Wolfgang R. Langhauser