Patents by Inventor John A. K. Cha

John A. K. Cha 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).

  • Synthesis of hyperbranched organometallic polymers and their use as precursors to advanced ceramic materials
    Patent number: 6759502
    Abstract: Hyperbranched organometallic polymers, including poly [1,1′-ferrocenylenesilynes], poly [1,1′-ferrocenylene-(alkyl)silynes], poly [1,1′-ferrocenylene(alkenyl)silynes] and poly [1,1′-ferrocenylene(aromatic)silynes], are useful as precursors to certain ceramic materials. Processes for the preparation of such polymers and the preparation of ceramic materials from such polymers are described, as are the resulting ceramic materials and their use as ferromagnetic materials and electrically conductive materials.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: July 6, 2004
    Assignee: The Hong Kong University of Science and Technology
    Inventors: Ben Zhong Tang, Kaitian Xu, Han Peng, Jingdong Luo, Xixiang Zhang, Qunhui Sun, Wing Yip Lam, John A. K. Cha