Patents by Inventor Colin D. Williams

Colin D. Williams 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).

  • Extruded ear plug
    Patent number: 5573015
    Abstract: An earplug having a compressible or deformable sheath component and a more rigid core component. The components are both extruded in order that they may be rapidly and efficiently produced, and then the extrudate is cut into discrete pieces to form earplugs. The earplugs may be cut to form a variety of specially shaped end portions.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: November 12, 1996
    Inventor: Colin D. Williams
  • Gel cushion insole
    Patent number: D555889
    Type: Grant
    Filed: June 12, 2006
    Date of Patent: November 27, 2007
    Assignees: LRC Products Limited, Pittsburgh Plastics Mfg., Inc.
    Inventors: Judith C. Anders, Colin D. Williams, James E. Zona, Richard E. Matuke