Patents by Inventor Nan-Chung Wu

Nan-Chung Wu 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).

  • Sintering process for AIN powder coated with Al film
    Patent number: 5842107
    Abstract: This patent application discloses a new process for preparing the sintered article of aluminum nitride at low temperature. It comprises coating aluminum metal film on aluminum nitride powder, then directly molding or homogeneously cold pressing, followed by sintering at 1650.about.175O.degree. C., and finally forming dense aluminum nitride article.
    Type: Grant
    Filed: August 31, 1995
    Date of Patent: November 24, 1998
    Assignee: National Science Council
    Inventors: Nan-Chung Wu, Huei-Jung Wang, Shin-Gei Chen
  • Process for producing a bioceramic composite material containing natural bone material on an alumina substrate
    Patent number: 5783248
    Abstract: A process is provided for producing a bioceramic composite in which an alumina based ceramic substrate is coated with an intermediate calcium pyrophosphate layer to cement a porous calcium phosphate material to the alumina based ceramic substrate. In one aspect of the invention, the porous calcium phosphate material is a porous lattice made from natural bone. A bioceramic composite which includes an alumina-based ceramic substrate, an intermediate calcium pyrophosphate layer and a porous natural bone material bonded to the intermediate calcium pyrophosphate layer is also disclosed.
    Type: Grant
    Filed: August 28, 1995
    Date of Patent: July 21, 1998
    Assignee: National Science Council of R.O.C.
    Inventors: Ruey-Mo Lin, Nan-Chung Wu, Kuang-Hsing Liu
  • Process for the preparation of LAS ceramic sintered bodies
    Patent number: 5320792
    Abstract: Disclosed is a process for preparing Li.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 ceramic sintered bodies. Lithium fluoride powder is added to a calcined Li.sub.2 O--Al.sub.2 O.sub.3 --SiO.sub.2 powder prepared by sol-gel process as sintering agent. The resulting powder mixture is compressed into a molded article and sintered at a temperature of 950.degree.-1250.degree. C. to obtain the sintered bodies of the invention. The sintered bodies according to the present invention have a relative density of 97.9% and a thermal expansion coefficient of 10.sup.-7 /.degree.C. magnitude.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: June 14, 1994
    Assignee: National Science Council
    Inventors: Nan-Chung Wu, Sheng Yang
  • Process for producing an ultrafine powder of aluminum nitride
    Patent number: 4992253
    Abstract: Disclosed is a process for producing an ultrafine powder of aluminum nitride. This process is characterized in adding 1-5 wt % of aluminum nitride powder to the mixture of alumina and carbon black and heating the resulting powder mixture at a temperature of 1550.degree.-1650.degree. C. in an atmosphere of nitrogen. Preferably, prior to heating, the powder mixture is shaped into a compact. The aluminum nitride powder prepared by the process of the present invention has an average particle diameter of about 0.45 micron and a purity of above 98.1%, and is therefore a very suitable material for making printed circuit boards and heat release boards for IC, LSI and VLSI.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: February 12, 1991
    Assignee: National Science Council
    Inventors: Nan-Chung Wu, Huei-Jung Wang