Patents by Inventor John H. Blackett

John H. Blackett 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).

  • Electrosurgical apparatus
    Patent number: 4122854
    Abstract: An electrosurgical apparatus has a monitor in the form of a voltage sensitive circuit. The circuit responds to an increase in the voltage of the apparatus to produce a control signal. The control signal operates a relay to switch off the apparatus and/or to produce an alarm signal.
    Type: Grant
    Filed: August 14, 1974
    Date of Patent: October 31, 1978
    Assignee: Matburn (Holdings) Limited
    Inventor: John H. Blackett