Patents by Inventor Hwahsing Tang

Hwahsing Tang 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).

  • Patent number: 6217816
    Abstract: An inorganic binder and a dissolving agent are put into ceramic powder. They are mixed to form a plastic green mixture. Then the said mixture is formed into a thin green layer. Preferably, this thin green layer will be preheated and dried such that the thin green layer will be hardened due to the bonding effect of the inorganic binder. A portion of the thin green layer exposed under a directed high-energy beam is sintered, preferably by a laser beam, to cause ceramic molecules to bond together locally due to heat fusion. By controlling the scanning path of the high-energy beam, a two-dimensional thin cross section of the ceramic part in arbitrary form can be produced. A second thin ceramic layer can be built onto the first thin ceramic layer and bonded to it by the same method. After multiple repetitions of this procedure a three dimensional ceramic part can be fabricated layer upon layer. The green portion, which is not scanned by the high-energy beam, will be removed with suitable method.
    Type: Grant
    Filed: January 13, 2000
    Date of Patent: April 17, 2001
    Assignee: National Science Council
    Inventor: Hwahsing Tang