Patents by Inventor Chung L. Chao

Chung L. Chao 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).

  • Drawing pen having multiple side-matched absorptive drawing tips
    Patent number: 5388924
    Abstract: A drawing pen for drawing lines having different shades, including a plurality of ink reservoirs received within a barrel thereof, and a plurality of absorptive drawing tips respectively connected to the ink reservoirs at the bottom and disposed outside the barrel for drawing, wherein the absorptive drawing tips having adjacent surfaces are complementary and engaged to one another by a watertight bonding agent.
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: February 14, 1995
    Inventor: Chung L. Chao
  • Crossed type double-clamp clip
    Patent number: 5319835
    Abstract: A crossed type double-clamp clip made by bending an iron wire into shape, having two clamping portions symmetrically disposed below a middle bend thereof and crossed over each other, each clamping portion being made in the configuration of an open loop, whereby the relative positions of the two clamping portions are adjusted according to the thickness of the stack of paper onto which the two clamping portions are clamped on one side and the middle bend is clamped on an opposite side.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: June 14, 1994
    Inventor: Chung L. Chao