Patents by Inventor Robert Dally Dworkin

Robert Dally Dworkin 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).

  • Patent number: 4085077
    Abstract: The presence of free carboxylic acids containing from 8 to 20 carbon atoms or the anhydrides of these acids inhibits the rate of heat induced discoloration exhibited by certain polymer formulations containing as a heat stabilizer the reaction product of a carboxylic acid with a stoichiometric excess, based on the number of carboxyl groups present, of a diorganotin oxide. The free acids are virtually ineffective heat stabilizers for these polymers in the absence of the aforementioned reaction product. The polymers which can be stabilized include vinyl chloride polymers and acrylonitrile-butadiene-styrene terpolymers.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: April 18, 1978
    Assignee: M&T Chemicals Inc.
    Inventors: Robert Dally Dworkin, Adam Joseph Ejk
  • Patent number: 4032552
    Abstract: Diorganotin carboxylates containing more than 1 mole of tin for every 2 moles of carboxylic acid ##STR1## residues are prepared by a solid state reaction between a diorganotin oxide and a dicarboxylic acid anhydride. Depending upon the temperature of the oxide-anhydride mixture, the reaction is substantially complete in from less than 1 to up to 48 hours and produces no by-products.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: June 28, 1977
    Assignee: M & T Chemicals Inc.
    Inventors: Robert Dally Dworkin, Adam Joseph Ejk