Patents by Inventor John R. Martinson, Jr.

John R. Martinson, Jr. 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).

  • Video signal mixer apparatus and method
    Patent number: 4335404
    Abstract: A method and apparatus for simultaneously delivering an external source of program material and the program material normally received by a television antenna to the antenna input terminals of a television set.
    Type: Grant
    Filed: October 10, 1980
    Date of Patent: June 15, 1982
    Inventor: John R. Martinson, Jr.