Patents by Inventor Donald G. Buchanan

Donald G. Buchanan 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).

  • Channel coupling
    Patent number: 4088902
    Abstract: An electrical circuit for use in controlling the coupling between two separate channels including a first transistor for connection in a first channel, a second transistor for connection in a second channel, a first and a second electrode of each transistor being connected in a respective output signal current carrying path, first signal coupling means connected between the said two first electrodes and second signal coupling means connected between the said two second electrodes, one of the said signal coupling means being variable.
    Type: Grant
    Filed: August 11, 1977
    Date of Patent: May 9, 1978
    Assignee: Strathearn Audio Limited
    Inventors: Donald G. Buchanan, Roderick F. Jones