Patents by Inventor Timothy R. Diephouse

Timothy R. Diephouse 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).

  • Oxidation products of paramethyl-substituted hindered phenols
    Patent number: 4915875
    Abstract: Paramethyl-substituted hindered phenols are selectively oxidized by contacting with an oxidizing agent at elevated temperatures in the presence of a heterogeneous oxidative coupling catalyst. In the absence of an optional nucleophile the products comprise carbon-carbon oxidative coupling products. In the presence of a nucleophile, addition products result that may be further oxidized by continued exposure to the oxidizing agent to yield substituted p-hydroxybenzaldehydes.
    Type: Grant
    Filed: November 4, 1986
    Date of Patent: April 10, 1990
    Assignee: The Dow Chemical Company
    Inventors: Timothy R. Diephouse, Robert M. Strom
  • Purification of 4,4-dihydroxybiphenyl
    Patent number: 4414422
    Abstract: 4,4'-Dihydroxybiphenyl is purified to remove sulfur-containing impurities, color bodies and/or phenyl-substituted phenol compounds by heating in the presence of a mixture of water and a water-miscible organic compound selected from acetone and C.sub.1-6 alkanols or diols for a time sufficient to remove substantial quantities of the sulfur-containing impurity, color bodies and/or phenyl-substituted phenol compound and thereafter recovering the purified 4,4'-dihydroxybiphenyl.
    Type: Grant
    Filed: May 10, 1982
    Date of Patent: November 8, 1983
    Assignee: The Dow Chemical Company
    Inventors: Mary L. Ash, Timothy R. Diephouse, Robert M. Strom