Patents by Inventor Y. Zhang

Y. Zhang 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).

  • Dual water-level toilet flushing apparatus
    Patent number: 5205000
    Abstract: A dual water-level toilet flushing apparatus (10) that allows a toilet user to easily and quickly select either a partial or a full toilet flush. The partial flush which is normally preset is recommended for flushing liquid waste while the full flush is recommended for flushing solid waste. The apparatus (10) which is easily installed and requires no modification to the toilet water tank (60) consists of three major elements: an overflow tube sleeve (12) that attaches to an overflow tube (64) and that has swivelly attached the back end of a floating inverted pendulum (20). The front of the pendulum is attached, via a pendulum/flapper valve link (24), to the front of a toilet flapper valve (30) having its back swivelly attached to the bottom of the overflow tube (64). To effect a partial flush, the toilet flush handle (68) is depressed and immediately released; to effect a full flush the handle (60) is depressed and held for a few seconds.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: April 27, 1993
    Inventors: Frank Z. Xia, Mary Z. Luo, Jack Y. Zhang
  • Cross-axis synchronous flow through coil planet centrifuge for large scale preparative countercurrent chromatography
    Patent number: 5104531
    Abstract: A countercurrent chromatography apparatus and method where the column rotates about an axis spaced apart from, parallel to, and in the same radial plane as a radius extending from the central axis of revolution. The apparatus generates a unique force field which enables excellent separation.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: April 14, 1992
    Assignee: The United States of America as represented by the Department of Health and Human Services
    Inventors: Yoichiro Ito, Tian Y. Zhang
  • Liquid crystal electrooptic memory device
    Patent number: 4984198
    Abstract: The disclosed liquid crystal electrooptic memory device uses a ferroelectric liquid crystal sandwiched by a pair of molecular oriented films attached to opposite surfaces thereof, and a pair of transparent conductive films are attached to the outside surfaces of the molecular oriented films, respectively. An impedance having a constant electrostatic capacitance and a variable resistance is connected to one of the transparent conductive films. Further, an electric pulse source is connected across the transparent conductive films through the impedance. When a pulse from the pulse source is applied to the transparent conductive films, light transmittance of the ferroelectric liquid crystal is set at different levels depending on the resistance of the impedance. Thus, the resistance of the impedance is memorized in the form of the light transmittance of the ferroelectric liquid crystal. The impedance can be in the form of a photoconductive film attached to the molecular oriented film.
    Type: Grant
    Filed: March 20, 1990
    Date of Patent: January 8, 1991
    Assignee: Tokyo University of Agriculture and Technology
    Inventors: Shunsuke Kobayashi, Hidenori Ikeno, Hiroki Maeda, Bai Y. Zhang, Masaaki Yoshida