Patents by Inventor Peter G. Knowles

Peter G. Knowles 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).

  • Polyester films containing substantially spherical particles useful as slot liners
    Patent number: 4274025
    Abstract: Polyester films containing 0.2 to 0.9% by weight of filler particles having a nominal particle size of 2 to 10 .mu.m and a hardness of 2.5 to 7 on the moh scale are suitable for the production of slot liners and closures. The films have improved resistance to fibrillation or delamination and tearing during the formation of the slot liners and closures and improved slip properties to promote their insertion into electrical stators and rotors.
    Type: Grant
    Filed: April 6, 1979
    Date of Patent: June 16, 1981
    Assignee: Imperial Chemical Industries Limited
    Inventors: Mohanlal S. Nerurkar, Peter G. Knowles
  • Voided films of polyester with polyolefin particles
    Patent number: 4187113
    Abstract: Opaque voided films having a total luminous transmission not exceeding 25% are made from blends of a polyester preferably polyethylene terephthalate, with 3 to 27% of an ethylene or propylene polymer, prepared by dry blending. One end use of the film, as a base for photographic prints is also described.
    Type: Grant
    Filed: November 3, 1977
    Date of Patent: February 5, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Carl F. Mathews, Christopher Deverell, Gordon E. A. Pears, Peter G. Knowles