Patents by Inventor William Dewhirst

William Dewhirst 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: 4192127
    Abstract: A method of producing twine composed of a plurality of thermoplastic mono filaments in a bundle which comprises, passing a bundle of thermoplastic monofilaments continuously along a path, imparting a false twist of 3 to 30 turns per linear foot to said bundle, applying a compatible molten thermoplastic spiral band to said twisted bundle as a spiral band to fuse said spiral band to the outer monofilaments, and recovering a twine having a portion of said false twist captured therein by fusion of the spiral band thereon.The apparatus for obtaining this twine consists of a path along which a bundle of thermoplastic synthetic monofilaments having a false twist therein can be continuously moved, means to direct a molten compatible thermoplastic on to said twisted bundle to form one or more spiral bands on said bundle and to fuse the outer monofilaments of the bundle to the spiral band, and means for imparting a false twist to said bundle at a point prior to said directing means.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: March 11, 1980
    Assignee: Exxon Research & Engineering Co.
    Inventors: John B. O'Neil, William Dewhirst