Patents by Inventor Richard J. Drew

Richard J. Drew 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).

  • Vas cautery apparatus
    Patent number: 4034762
    Abstract: This vas cautery apparatus includes a bipolar needle electrode, a pencil hand control, and a cautery electronic circuit. The bipolar needle electrode comprises a unitary center conductor and tip and the center conductor may be effectively insulated from an outer conductor by an insulating tubing. A relatively easily manipulated electrical connector joins the bipolar needle electrode to the pencil hand control. An output waveform from the cautery electronic circuit has an alternating potential characteristic during periods of the waveform.
    Type: Grant
    Filed: August 4, 1975
    Date of Patent: July 12, 1977
    Assignee: Electro Medical Systems, Inc.
    Inventors: G. Ronald Cosens, Richard J. Drew