Patents by Inventor Harry D. Campbell

Harry D. Campbell 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).

  • Television signal substitution
    Patent number: 4974085
    Abstract: A received television signal (such as a television commercial) is substituted out in favor of a local recorded signal on a record containing the substitute signal. A detector detects a command signal indicative of a broadcast program signal to be substituted out. An RF switch is operable to selectively supply the broadcast program signal or the substitute signal to the television receiver. A signal matching circuit is responsive to the broadcast program signal and the substitute signal to match the levels of both the audio and video portions of the substitute signal to the program signal.
    Type: Grant
    Filed: May 2, 1989
    Date of Patent: November 27, 1990
    Assignee: Bases Burke Institute, Inc.
    Inventors: Harry D. Campbell, Kenneth W. Silvers, Chang J. Kim