Patents by Inventor Rudolph Cordes

Rudolph Cordes 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: 4346230
    Abstract: A process for the preparation of dimethyl terephthalate by the oxidation of p-xylene/methyl p-toluate mixtures, preferably with air, esterification of the resulting acid products, and recycling of the methyl p-toluate to the oxidation stage, employs an oxidation catalyst consisting of a combination of cobalt and manganese compounds. The concentration of manganese (Mn.sup.++) ranges between about 0.0001% and about 0.005% by weight.
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: August 24, 1982
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gerhart Hoffmann, Rudolph Cordes, Wolfgang Merkel