Patents by Inventor Rong S. Jan

Rong S. Jan 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).

  • Adjustable book stand
    Patent number: 5273247
    Abstract: A book stand includes a base, a post extended upward from the base, a sleeve slidably engaged on the post and movable up and down along the post, a housing rotatably disposed on the sleeve at a vertical axis, and a board rotatably disposed on the housing at a lateral axis. The height of the board can be adjusted when the sleeve slides along the post, and the angular positions of the board can be adjusted when the housing rotates about the vertical axis and when the board rotates about the lateral axis.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: December 28, 1993
    Inventor: Rong S. Jan
  • Retractable knife
    Patent number: 5099578
    Abstract: An improved retractable knife comprises two coalescent casings which has a sliding seat and a driving button inside. Two casings are combined firmly so that the sliding seat can move inside the casings firmly.
    Type: Grant
    Filed: May 7, 1991
    Date of Patent: March 31, 1992
    Inventor: Rong S. Jan