Patents by Inventor Xu Hengchang

Xu Hengchang 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).

  • Inorganic filler material with retention properties, and method and use of such material
    Patent number: 5707440
    Abstract: A finely divided inorganic filler material is a sintered composite which consists of larger macro-filler particles of glass and of smaller micro-filler particles of glass or ceramics partially covering the macro-filler particle and firmly connected to it by sintering. Plastic materials reinforced with the filler are distinguished by improved abrasion resistance.
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: January 13, 1998
    Assignee: Heraeus Kulzer GmbH
    Inventors: Xu Hengchang, Joachim Nagel