Patents by Inventor David Y. Chu

David Y. Chu 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: 4200403
    Abstract: A writing implement having a body formed by a pair of leaves each having a longitudinally extending bore therein, with the bores in the two leaves coaxial and the two leaves interengaged in the manner of a hinge, and a writing member, such as a pencil lead or ball-point pen with an ink reservoir, extending through the coaxial bores in the two members, the two leaves being relatively pivotable about the axis of the coaxial bores therein between a storage configuration in which the leaves lie substantially in the same plane and a writing configuration in which the planes of the two leaves are at an acute angle to one another. The writing member is preferably secured to an axially movable plunger in the coaxial bores, which plunger has grooves co-operating with projections from the leaves such that a writing tip of the writing member is caused to project from one end of the leaves upon movement of the leaves from the storage to the writing configuration.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: April 29, 1980
    Inventor: David Y. Chu
  • Patent number: D256372
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: August 12, 1980
    Inventor: David Y. Chu