Patents by Inventor Jonathan B. Siegel

Jonathan B. Siegel 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).

  • Patent number: 5720208
    Abstract: An adjustable spur center device for use with lathe machines. The spur center features easily interchangeable center points, one that can be either extended or retracted without removing the spur center from the lathe or dismounting the workpiece, and the other a spring-loaded version that permits an operator to remove or insert a workpiece without having to stop the rotation of the spindle. The spur center also features individually adjustable spurs that can be easily removed for resharpening or replacement.
    Type: Grant
    Filed: June 21, 1996
    Date of Patent: February 24, 1998
    Inventor: Jonathan B. Siegel