Patents by Inventor Donald O. Shaffer

Donald O. Shaffer 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).

  • Automatic color change electrostatic paint spray system
    Patent number: 4232055
    Abstract: An improved method and apparatus is disclosed for sequentially electrostatic spraying different ones of a plurality of electrically conductive paints from a plurality of paint sources. Each paint source is connected through a separate electrically non-conductive first hose to a manifold and then through a single second hose to a spray gun. After spraying, at least the first hose which carries the sprayed paint is purged of paint and dried to electrically isolate the source of the first paint from the manifold when a second paint is sprayed.
    Type: Grant
    Filed: April 24, 1979
    Date of Patent: November 4, 1980
    Assignee: Champion Spark Plug Company
    Inventor: Donald O. Shaffer