Patents by Inventor Dean J. Mao

Dean J. Mao 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).

  • Side shifter attachment and retainer for lift truck attachments
    Patent number: 5368435
    Abstract: A side shifter (20) attachment for a lift truck (10) having an upper crossbar (44) and a lower crossbar (46) is disclosed. The side shifter has a rigid frame (24) slideably positioned with respect to the upper and lower crossbars (44, 46) of the lift truck. The frame (24) has an upper horizontal cross member (26) and a lower horizontal cross member (28). A low-friction slide block (80)is positioned on the lower horizontal cross member (28). A lower intermediate plate (81) having a first (75) and a second (77) surface is positioned between the slide block (80) and the lower crossbar (46). The first surface (75) is in contact with the slide block (80) and the second surface is in contact with the lower crossbar (46). At least the first surface (75) of the lower intermediate plate (81) has a smooth, low-friction surface to facilitate sliding of the lower horizontal cross member (28) with respect to the lower crossbar (46).
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: November 29, 1994
    Assignee: Brudi, Inc.
    Inventors: Wayne W. Bostad, Donald C. Morrison, Dean J. Mao