Patents by Inventor Kai-Der Ker

Kai-Der Ker 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).

  • Infrared sensitive electrophtographic photoreceptors and method for tuning photosensitiviey thereof
    Patent number: 6068958
    Abstract: A family of photoreceptors for use in electrophotography are disclosed which contain a binary charge generation composition of oxytitanium phthalocyanine and copper phthalocyanine. The charge generation composition exhibits adjustable photosensitivity by adjusting a ratio between said oxytitanium phthalocyanine and said copper phthalocyanine. To optimize its performance, the charge generation composition is subject to an ammonia-modified complexation-mediated crystal transformation, and the resultant composition is characterized by Bragg diffraction angles (2.theta..+-.2.degree.) of 7.7, 9.4, 10.7, 13.3, 15.2, 15.7, 26.3, 27.4, and 28.4 degrees with respect to the CuK.alpha. characteristic X-ray wavelength at 1.54 .ANG. and absorption maxima centered around 615, 690, and 770 nm in the optical absorption spectrum.
    Type: Grant
    Filed: August 20, 1998
    Date of Patent: May 30, 2000
    Assignee: Sinonar Corporation
    Inventors: Chen-Jen Yang, Kuo-Chu Yeh, Tsong-Shin Jean, Kai-Der Ker