Patents by Inventor Clifford C. Chang

Clifford C. Chang 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).

  • FIBER-REINFORCED THERMOPLASTIC PIPE
    Publication number: 20110174410
    Abstract: Disclosed is a reinforced thermoplastic pipe, comprising a thermoplastic polymer inner tube, a thermoplastic polymer outer tube and a reinforcing fabric between the thermoplastic polymer inner tube and the thermoplastic polymer outer tube. The reinforcing fabric comprises thermosettable thermoplastic polymer weft yarns and unidirectionally woven warp yarns. The warp yarns are twisted into twisted cords. Disclosed is also a process of making the reinforced thermoplastic pipe.
    Type: Application
    Filed: November 13, 2009
    Publication date: July 21, 2011
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Xuedong Li, Clifford C. Chang
  • Multi-layer film having self-limiting heat seal, and methods relating thereto
    Patent number: 5478645
    Abstract: The present invention relates generally to a multilayer packaging structure which: 1. has a relatively broad heat seal temperature, and 2. provides an easy open seal, even at very high heat seal temperatures. More specifically, the films of the present invention are preferably multilayer structures comprising: 1. a support film, such as a polyester; 2. an olefinic homopolymer or copolymer interface layer; and 3. a heat seal outer layer.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: December 26, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Clifford C. Chang