Patents by Inventor Frank P. Petrella

Frank P. Petrella 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).

  • Positioning device and method of use
    Patent number: 5725344
    Abstract: A positioning device (20) which permits precise adjustment and retention of the longitudinal position of a screw member (30) within a threaded receptacle (22) in incremental detent steps includes the screw member (30) having at least one spring member (42) and the threaded receptacle (22) having a plurality of circumferentially spaced longitudinal grooves (28). As the screw member (30) is rotated within the threaded receptacle (22), the spring member (42) sequentially engages the spaced longitudinal grooves (28) in incremental detent steps. The engagement between the spring member (42) and a longitudinal groove (28) retains the screw member (30) in a desired detent position, thereby resisting unwanted rotation as from vibration or thermal cycling.
    Type: Grant
    Filed: February 1, 1997
    Date of Patent: March 10, 1998
    Assignee: G. W. Lisk Company, Inc.
    Inventor: Frank P. Petrella