Patents by Inventor Paul M. Twichell

Paul M. Twichell 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).

  • Stone setting press
    Patent number: 4077284
    Abstract: A stone setting press for securely fastening stones to settings comprising an arbor supported on a frame or base, shaped to receive and support a ring setting. A forming die at the end of a shaft is shaped to deform the prongs of a setting about a stone. The shaft is supported on the frame for axial movement to and from a position in which the die shapes the prongs. A leverage system having variable mechanical advantage is used to actuate the shaft.
    Type: Grant
    Filed: October 29, 1975
    Date of Patent: March 7, 1978
    Assignee: Guertin Brothers, Inc.
    Inventor: Paul M. Twichell