Patents by Inventor Daniel E. Butler

Daniel E. Butler 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).

  • Cardiac pacemaker
    Patent number: D311580
    Type: Grant
    Filed: June 24, 1988
    Date of Patent: October 23, 1990
    Assignee: Physio-Control Corporation
    Inventors: Daniel E. Butler, Neil G. McIlvaine