Patents by Inventor Sandford R. Willford

Sandford R. Willford 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: 5221387
    Abstract: The present invention is directed to a heat shrink clad core optical conduit and to an optical conduit having either a thermoplastic, thermoset or liquid, light transmitting core surrounded by, preferably a fluoropolymer cladding which is in turn surrounded by a tight-fitting, finish polymer jacket which may be either transparent or translucent, and is preferably made of a polyvinyl chloride, polycarbonate, acrylic or silicone material. Numerous fillers and inserts may be used in the finish jacket polymer and the finish jacket polymer may be formed into various shapes. Bondable jacket materials may be used. The preferred method of forming the manufacturing jacket around a heat shrinkable fluoropolymer cladding is by extruding a low extrusion temperature polymer over a heat shrink clad in its expanded form into which an increased interior pressure is maintained to prevent shrinkage during the extrusion process.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: June 22, 1993
    Assignee: Lumenyte International Corporation
    Inventors: John A. Robbins, Jamshid J. Zarian, Sandford R. Willford
  • Patent number: 5067831
    Abstract: The present invention is directed to a heat shrink clad core optical conduit and to an optical conduit having either a thermoplastic, thermoset or liquid, light transmitting core surrounded by, preferably a fluoropolymer cladding which is in turn surrounded by a tight-fitting, finish polymer jacket which may be either transparent or translucent, and is preferably made of a polyvinyl chloride, polycarbonate, acrylic or silicone material. Numerous fillers and inserts may be used in the finish jacket polymer and the finish jacket polymer may be formed into various shapes. Bondable jacket materials may be used. The preferred method of forming the manufacturing jacket around a heat shrinkable fluoropolymer cladding is by extruding a low extrusion temperature polymer over a heat shrink clad in its expanded form into which an increased interior pressure is maintained to prevent shrinkage during the extrusion process.
    Type: Grant
    Filed: December 13, 1989
    Date of Patent: November 26, 1991
    Assignee: Lumenyte International Corporation
    Inventors: John A. Robbins, Jamshid J. Zarian, Sandford R. Willford
  • Patent number: RE36157
    Abstract: The present invention is directed to a heat shrink clad core optical conduit and to an optical conduit having either a thermoplastic, thermoset or liquid, light transmitting core surrounded by, preferably a fluoropolymer cladding which is in turn surrounded by a tight-fitting, finish polymer jacket which may be either transparent or translucent, and is preferably made of a polyvinyl chloride, polycarbonate, acrylic or silicone material. Numerous fillers and inserts may be used in the finish jacket polymer and the finish jacket polymer may be formed into various shapes. Bondable jacket materials may be used. The preferred method of forming the manufacturing jacket around a heat shrinkable fluoropolymer cladding is by extruding a low extrusion temperature polymer over a heat shrink clad in its expanded form into which an increased interior pressure is maintained to prevent shrinkage during the extrusion process.
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: March 23, 1999
    Assignee: Lumenyte International Corp.
    Inventors: John A. Robbins, James R. Zarian, Sandford R. Willford