Patents by Inventor Luther L. Roberts

Luther L. Roberts 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).

  • Surface treatment of rigid polyvinyl chloride
    Patent number: 4154887
    Abstract: Rigid polyvinyl chloride article and method for making same. The article comprises a substrate of PVC containing metallic soap of C.sub.8 -C.sub.22 fatty acid which is coated with an anionic phosphate acid ester surfactant and then a protective top coat. The surfactant improves adhesion of the top coat.
    Type: Grant
    Filed: March 31, 1978
    Date of Patent: May 15, 1979
    Assignee: GAF Corporation
    Inventors: Fred S. Morshauser, Luther L. Roberts
  • Roof stack vent
    Patent number: D257282
    Type: Grant
    Filed: February 8, 1979
    Date of Patent: October 7, 1980
    Assignee: GAF Corporation
    Inventor: Luther L. Roberts
  • Roof stack vent
    Patent number: D257283
    Type: Grant
    Filed: February 8, 1979
    Date of Patent: October 7, 1980
    Assignee: GAF Corporation
    Inventor: Luther L. Roberts