Patents by Inventor Paul P. W. Cheung

Paul P. W. Cheung 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: 5329843
    Abstract: A cherry pitter comprising a pitting station (24) adapted to support a cherry (88) having an opening 84 sized to allow passage of a pit (85), but not the cherry (88). A pit ejector (26) adapted to reciprocate along a longitudinal axis includes an elongate punch having a number of arms (50, 52, 54, 56) radiating out from the longitudinal axis, each arm extending beyond the proximal end of the punch to form a cruciform cross-section. One of the arms (56) has a substantially flat profile and the other three arms (50, 52, 54) have an undercut portion (66) of the same order of axial length as the diameter of a typical cherry. The punch is oriented so that the flat arm (56) projects towards a delivery passage (22). The delivery passage (22) has an arcuate channel that aligns the cherries and delivers them to the pitting station (24) one at a time. The elongate punch drives into the cherry (86) and pushes the pit through the outer flesh of the cherry (86) and through the opening (84) and into a pit chamber (94).
    Type: Grant
    Filed: August 11, 1992
    Date of Patent: July 19, 1994
    Assignee: Maxpat Trading & Marketing (Far East) Limited
    Inventor: Paul P. W. Cheung
  • Patent number: D492165
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: June 29, 2004
    Assignee: Maxpat Trading & Marketing (Far East) Limited
    Inventor: Paul P. W. Cheung
  • Patent number: D330833
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: November 10, 1992
    Assignee: Maxpat Trading & Marketing (Far East) Limited
    Inventor: Paul P. W. Cheung