Patents by Inventor Chien M. Wai

Chien M. Wai 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).

  • Hydroxamic acid crown ethers
    Patent number: 5274129
    Abstract: Novel derivatives of hydroxamic acid chelating agents for the chelation of f-block elements, yttrium and scandium and methods for the extraction of such elements.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: December 28, 1993
    Assignee: Idaho Research Foundation, Inc.
    Inventors: Nicholas R. Natale, Chien M. Wai, Sadik Elshani
  • Methods and devices for the separation of radioactive rare earth metal isotopes from their alkaline earth metal precursors
    Patent number: 5225173
    Abstract: Methods and devices for the separation of a radioactive rare earth metal isotopes or a radioactive isotope of yttrium or scandium from their alkaline earth metal precursors with ionizable dibenzo ether derivatives.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: July 6, 1993
    Assignee: Idaho Research Foundation, Inc.
    Inventor: Chien M. Wai
  • Extraction of trace metals from fly ash
    Patent number: 4475993
    Abstract: A process for recovering silver, gallium and/or other trace metals from a fine grained industrial fly ash associated with a process for producing phosphorous, the fly ash having a silicate base and containing surface deposits of the trace metals as oxides, chlorides or the like, with the process being carried out by contacting the fly ash with AlCl.sub.3 in an alkali halide melt to react the trace metals with the AlCl.sub.3 to form compositions soluble in the melt and a residue containing the silicate and aluminum oxide or other aluminum precipitate, and separating the desired trace metal or metals from the melt by electrolysis or other separation techniques.
    Type: Grant
    Filed: August 15, 1983
    Date of Patent: October 9, 1984
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Milton Blander, Chien M. Wai, Zoltan Nagy