Patents by Inventor Donald Kirkbright Black

Donald Kirkbright Black 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).

  • Stabilization with alkali metal compound material of certain thermally unstable DMT
    Patent number: 4058663
    Abstract: Disclosed is the stabilization of thermally unstable, fresh dimethyl terephthalate of at least 99.8 weight % purity, free of alkali metal compound material, and produced by the cooxidation-esterification process. Stabilization is effected by incorporating therein a stabilizing quantity of alkali metal compound material having no significant concentration of either phosphonic acid moiety or phosphite moiety.
    Type: Grant
    Filed: March 2, 1976
    Date of Patent: November 15, 1977
    Assignee: Hercules Incorporated
    Inventor: Donald Kirkbright Black