Patents by Inventor Randall R. Hopper

Randall R. Hopper 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: 3950480
    Abstract: A method for embossing thermoplastic material and the thermoplastic material produced thereby. A transverse section of a continuous length of preformed thermoplastic film is heated by a nondirect contact heat source to raise the temperature of the film above its softening point. The film is then fed immediately between adjacent, counter-rotating embossing rollers, thereby embossing a raised pattern onto the film. The rollers are cooled to fix the embossed pattern on the film. The embossed film has good moduli, low surface gloss or light reflectance, deep embossed pattern, high tensile strength and high impact strength.
    Type: Grant
    Filed: May 7, 1975
    Date of Patent: April 13, 1976
    Assignee: Ethyl Corporation
    Inventors: James M. Adams, Randall R. Hopper, Robert R. Pease, Garland E. Raley