Patents by Inventor John A. Renfro

John A. Renfro 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).

  • Pay telephone unit
    Patent number: D342251
    Type: Grant
    Filed: August 27, 1992
    Date of Patent: December 14, 1993
    Assignee: Intellicall, Inc.
    Inventors: John A. Hird, Todd J. Betz, John A. Renfro, Ray S. Naeini