Patents by Inventor Donald L. Deardorff

Donald L. Deardorff 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).

  • Titanium compounds
    Patent number: 4788172
    Abstract: New compositions and methods of preparing hydrolyzed titanium chelates are disclosed. New chelates of tetra-isopropyl titanate with alkanolamines in 1/1 mole ratios have high activity as catalysts and exhibit surprising chemical characteristics as reactive intermediates. New partially hydrolized chelates are water soluble, chemically reactive and highly active as esterification catalysts.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: November 29, 1988
    Inventor: Donald L. Deardorff
  • Removal of catalyst residues from polyesters
    Patent number: 4506091
    Abstract: A process for preparing esters which comprises reacting a polycarboxylic acid with an excess of alcohol and in the presence of an organotitanate catalyst, treating the crude mixture with a suitable chelate compound, removing the unreacted alcohol and hydrolyzing the treated titanium catalyst residues with steam, and recovering the purified ester by filtration.
    Type: Grant
    Filed: September 1, 1983
    Date of Patent: March 19, 1985
    Inventor: Donald L. Deardorff