Patents by Inventor Terry Tgavalekos

Terry Tgavalekos 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).

  • Uniform hydrolysis catalyst addition to ethylene-vinyl ester polymers
    Patent number: 4230825
    Abstract: Process for the production of partially-hydrolyzed ethylene-vinyl ester interpolymers by the controlled alcoholysis of the base resins, in which discoloration of the hydrolyzed products is suppressed by the rapid addition of the alcoholysis catalyst to the reaction medium. In reactions carried out over periods of from 0.5 to 200 minutes, the catalyst is thus added to the medium within periods of from 0.1 to 20 minutes at substantially uniform rates varying by no more than .+-.25% over the period of addition. Substantially colorless hydrolyzed resins of particular application for packaging films are thereby produced.
    Type: Grant
    Filed: October 26, 1978
    Date of Patent: October 28, 1980
    Assignee: National Distillers and Chemical Corporation
    Inventors: Michael F. Hardy, Terry Tgavalekos