Patents by Inventor Kinio Iba

Kinio Iba 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).

  • Method and apparatus for measuring lifetime of semiconductor material including waveguide tuning means
    Patent number: 5138255
    Abstract: A method and apparatus measure the lifetime of semiconductor materials having resistivity values within a predetermined measurement range. Carriers are produced within the semiconductor material responsive to incident energy. Microwave energy is radiated from a waveguide onto the semiconductor material to obtain reflected microwave energy. The equivalent distribution circuit characteristics of the waveguide are varied such that a variation of a magnitude of the reflective microwave energy relative to a resistivity of the semiconductor material is substantially linear within the predetemined measurement range. Plural stub tuners are provided within the waveguide to obtain the desired linear characteristics. The lifetime measurement is obtained in accordance with an attenuation of the produced carriers.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: August 11, 1992
    Assignee: Semitex Co., Ltd.
    Inventors: Tateo Kusama, Kinio Iba