Patents by Inventor Donald B. Butterfield

Donald B. Butterfield 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).

  • Method and apparatus for electrochemical machining of spray holes in fuel injection nozzles
    Patent number: 5026462
    Abstract: The inner end of a spray hole in a fuel injection nozzle for an internal injection engine is electrochemically machined by providing a negative electrode inside a chamber in said body, while applying an electrolyte under pressure to the exterior of the nozzle body, so as to cause the electrolyte to flow through the spray hole inwardly of said body. The electrolyte is preferably an aqueous solution of NaCl.
    Type: Grant
    Filed: March 6, 1990
    Date of Patent: June 25, 1991
    Assignee: AIL Corporation
    Inventors: Donald B. Butterfield, Alcide Sgarzi