Patents by Inventor Richard L. Sprague

Richard L. Sprague 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).

  • Ignition distributor rotor having a silicone varnish coated output segment for suppressing noise and a method of manufacture therefor
    Patent number: 4208554
    Abstract: The output segment of an ignition distributor rotor having an output segment and a spring contact member in series is coated with a silicone varnish dielectric material for effecting the suppression of radio frequency interference radiation and, toestablish an electrical connection between the ignition distributor rotor spring contact member and the silicone varnish coated rotor output segment, a potential is applied across the spring contact member, the rotor output segment and an air gap in series and of a sufficient level to overstress the dielectric strength of the silicone varnish material to thereby effect a rupture of the silicone varnish material to establish an electrical connection through electrical arcing between the spring contact member and the rotor output segment.
    Type: Grant
    Filed: November 22, 1978
    Date of Patent: June 17, 1980
    Assignee: General Motors Corporation
    Inventor: Richard L. Sprague