Patents by Inventor Moon Ki Chang

Moon Ki 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: 4101382
    Abstract: The ease and speed of known enzymatic assays of micro-amounts of urea is improved by a novel reagent assay comprising: urease, buffers, and an indicator dye, the improvement wherein a mixed buffer system is present which mitigates against the effects of temperature changes during the assay, and a novel method of determining released ammonia with an indicator dye and spectrophotometer.
    Type: Grant
    Filed: December 5, 1975
    Date of Patent: July 18, 1978
    Inventor: Moon Ki Chang
  • Patent number: 3950226
    Abstract: The ease and speed of known enzymatic assays of micro-amounts of urea is improved by a novel reagent assay comprising: urease, buffers, and an indicator dye, the improvement wherein a mixed buffer system is present which mitigates against the effects of temperature changes during the assay, and a novel method of determining released ammonia with an indicator dye and spectrophotometer.
    Type: Grant
    Filed: October 31, 1974
    Date of Patent: April 13, 1976
    Inventor: Moon Ki Chang