Patents by Inventor Otto W. Bleh, deceased

Otto W. Bleh, deceased 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 preparation of dimethyl terephthalate
    Patent number: 4126755
    Abstract: A process for producing dimethyl terephthalate from high-boiling tarry residues from the combined oxidation of p-xylene and p-toluate in the liquid phase, esterification of the resulting acids with methanol and separation of the resulting dimethyl terephthalate which include the steps of subjecting the high-boiling residues to treatment with methanol at temperatures above 250.degree. C. and thereafter separating the resulting dimethyl terephthalate in accordance with conventional separation techniques.
    Type: Grant
    Filed: September 12, 1973
    Date of Patent: November 21, 1978
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Heinrich Bunger, Otto W. Bleh, deceased