Patents by Inventor Shizheng Zhen

Shizheng Zhen 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).

  • X-ray to visible image converter with a cathode emission layer having non-uniform density profile structure
    Patent number: 5225670
    Abstract: High quantum efficiency (.gtoreq.5%) ultrafast (.ltoreq.100 picosecond) and broad band (30 KeV to 80 KeV for medical application) X-ray photo-electron cathode, high gain X-ray real time image intensifier and portable low intensity real time projection type X-ray imagescope use new vacuum photo-electron devices. A new type X-ray photo-electron cathode has a specially designed alkali halide electron emission layer that makes possible high quantum efficiency, high speed and broad band X-ray photon detection. An X-ray photo-electron cathode followed by a direct coupled micro channel plate and an output phosphor display screen form a new type panel shaped direct view X-ray intensifier tube which can have both high spatial resolution (.gtoreq.10 lp/mm) and high gain (.gtoreq.10.sup.4). The thickness of this panel shaped disc X-ray intensifier can be less than 1 cm.
    Type: Grant
    Filed: March 6, 1991
    Date of Patent: July 6, 1993
    Assignee: CSL Opto-Electronics Corp.
    Inventors: Yangzheng She, Weilou Cao, Xiaowen Yang, Shizheng Zhen, Xinan Lu, Hanping Wang, Ming-guang Li, Yanhua Shih