Patents by Inventor Judy A. Johnston

Judy A. Johnston 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).

  • Colored polyethylene terephthalate composition and process of its manufacture
    Patent number: 5686515
    Abstract: A process for manufacture of articles comprised of polyethylene terephthalate wherein the PET is colored with a composition comprised of a wax dispersant, ethylene copolymer, and a colorant. In a preferred embodiment, the wax dispersant is a maleated polyethylene wax. In an alternative embodiment, the wax dispersant is a low molecular weight polyethylene wax and the composition further includes linear low density polyethylene. A preferred ethylene copolymer is ethylene-(meth)acrylic acid.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: November 11, 1997
    Assignee: The M.A. Hanna Company
    Inventors: Tracy L. Phillips, Ronald M. Harris, Alan R. Burgess, Judy A. Johnston