Patents by Inventor Maw-Guay Chang

Maw-Guay Chang 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: 5066463
    Abstract: A fecal examination apparatus includes: an extension tube laterally protruding from an upper hollow portion of a housing so that a test reagent may be dripped into the extension tube to be in contact with a fecal sample in the tube for performing an occult blood test of liquid identification, and a platform formed on the upper hollow portion of the housing having two windows communicated with the hollow portion of the housing respectively overlaid with two filter papers respectively impregnated with reagents of high-sensitivity and low-sensitivity so that an occult blood test both for high sensitivity and low sensitivity can also be conducted on the two filter papers on the platform, thereby providing an instrument for examining fecal sample with multiple choices and purposes.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: November 19, 1991
    Inventor: Maw-Guay Chang