Patents by Inventor Cheng-Siung Yeh

Cheng-Siung Yeh 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).

  • Arithmetic counter
    Patent number: 4993952
    Abstract: An arithmetic counter that includes a U-shaped support structure for a horizontal rod. Consecutively numbered beads are slidably arranged on the rod for adjustment to positions wherein selected numbers of the beads are separated from the remaining beads. One or more marker boards are adopted to be hung from the rod between the separated beads and the remaining beads, such that a small child can count the beads and achieve and better understand "addition" and "subtraction" processes.
    Type: Grant
    Filed: October 30, 1989
    Date of Patent: February 19, 1991
    Assignee: Lucky Star Enterprise Co., Ltd.
    Inventor: Cheng-Siung Yeh