Patents by Inventor Hoi-Bui Chui

Hoi-Bui Chui 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).

  • Pocket calculator
    Patent number: 5105068
    Abstract: A pocket calculator for use by two persons simultaneously comprises two keyboards and four displays so that each user can monitor entries and calculations by the other. The calculator is useful in a variety of situations including financial negotiations, crossing checking of calculation, and in a pupil teacher situation.
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: April 14, 1992
    Inventor: Hoi-Bui Chui