Patents by Inventor David F. Fredrickson

David F. Fredrickson 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: 5799996
    Abstract: A multi-function hand tool includes a handle assembly (20) comprising a plurality of handle segments (22, 32, 42) selectively connectible end to end to provide a handle having a length appropriate for the function to be performed. The handle assembly further includes a counterweight (52), a D-type handle (62), and various adaptors (72, 82, 92) whereby the handle assembly may be configured to the performance of a specific function. The multi-function hand tool further comprises a plurality of tool heads (100, 110, 120, 130, 140, 150, 160, 170, 190, 200, 210) which are selectively engageable with the handle assembly to configure the multi-function hand tool to the performance of a desired function.
    Type: Grant
    Filed: February 20, 1997
    Date of Patent: September 1, 1998
    Inventor: David F. Fredrickson
  • Patent number: 5722471
    Abstract: A tool 10 for rock breaking, log splitting and similar operations includes a plate 12 having a plurality of identical apertures 14 formed therethrough. A frame 16 comprised of a skirt 18 formed from lengths of angle iron and a plurality of legs also formed from lengths of angle iron supports the plate 12 in a substantially horizontal orientation above a workpiece. An implement 22 includes a first end for engaging the workpiece and a second end to be engaged with a hammer. The implement is further characterized by dimensions closely matched to those of the apertures formed in the plate. The plate 12 positions the implement 22 in engagement with the workpiece and maintains the implement 22 in a substantially vertical orientation for engagement by an actuating hammer.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: March 3, 1998
    Inventor: David F. Fredrickson