Patents by Inventor John P. Butterfield

John P. 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).

  • Stuffing box with bellows to allow shaft gyratory movements
    Patent number: 4330135
    Abstract: A stuffing box to surround a shaft projecting from a container and comprising a casing containing an annular bellows which serves to provide for gyratory or like movements of the shaft.
    Type: Grant
    Filed: November 14, 1980
    Date of Patent: May 18, 1982
    Assignee: Jude Engineering Inc.
    Inventor: John P. Butterfield