Patents by Inventor Eric N. Stech

Eric N. Stech 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 manufacture of aromatic polycarboxylic acids having delta Y values below ten
    Patent number: 4405809
    Abstract: A process for purifying aromatic polycarboxylic acid produced by liquid phase catalytic oxidation of polyalkyl aromatic hydrocarbon to remove undesirable aldehyde aromatic carboxylic acid and other impurities including the step of contacting an aqueous solution of said impure acid and hydrogen with a noble metal-containing catalyst, our improvement comprising eliminating any gas phase during the contacting step and conducting said contacting step with said aqueous solution by maintaining hydrogen at about 10 to about 75 percent of saturation in the liquid reaction medium to produce purified aromatic polycarboxylic acid having delta Y values below ten.
    Type: Grant
    Filed: December 4, 1981
    Date of Patent: September 20, 1983
    Assignee: Standard Oil Company (Indiana)
    Inventors: Eric N. Stech, Mark S. Montgomery, J. Frederick Bates