Patents by Inventor Mark D. Hartzell

Mark D. Hartzell 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: 5678315
    Abstract: An open-ended handle is disclosed for use with framed saws, such as coping saws. The open-ended handle is generally J-shaped and has a grip member that is perpendicular to the saw blade. The open-ended handle is mounted to the saw such that the grip member is also symmetrical about the mounting point. The present invention provides an arrangement in which the hand-grip portion of the handle is symmetrical about a longitudinal axis of motion when the saw is in use to allow the greatest amount of power to be transferred to the saw blade along a single line of force which not only provides for accurate cutting, but also eases tension on the user's hand and wrist to reduce fatigue. This arrangement provides a saw that is equally balanced and usable in both an upright position and an inverted position for accurate and easy cutting in a downward direction as well as an upward direction.
    Type: Grant
    Filed: July 2, 1996
    Date of Patent: October 21, 1997
    Inventor: Mark D. Hartzell