Patents by Inventor Roland C. Warthan

Roland C. Warthan 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: 4078643
    Abstract: A token operated control system for use with a multitrack tape cartridge player which enables a priori manual selection of a single track from one or more tape cartridge players for reproduction and which provides automatic termination of track reproduction at the end of a given track. Interruption of track reproduction, once reproduction has begun, is prevented by the control system circuitry. The control system is compatible with several commercially available eight-track tape cartridge tape players and includes additional circuitry for sequentially arriving at a single track of a given cartridge player unit specified by manual operation of panel switches after the insertion of a token, e.g., a coin.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: March 14, 1978
    Assignee: David B. Warthan
    Inventors: David Benjamin Warthan, Roland C. Warthan