Patents by Inventor Mark T. Oyen

Mark T. Oyen 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).

  • Stable reagent and kinetic assay for alpha-amylase
    Patent number: 4990445
    Abstract: A stable reagent and kinetic assay for .alpha.-amylase is provided. The reagent comprises a substrate for the .alpha.-amylase and various enzymes and cofactors necessary to produce NADH as the end-product of a series of four reactions. The substrate, enzymes, and cofactors are provided in sufficient excess that the .alpha.-amylase from the test sample is the rate-limiting factor. The concentration of .alpha.-amylase in a test sample is determined by measuring the rate of increase in absorbance caused by the production of NADH. The use of the novel cofactor fructose-1,6-diphosphate has been found to impart improved stability to the reagent.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: February 5, 1991
    Assignee: Beckman Instruments, Inc.
    Inventors: Sandra M. Poudrier, Mark T. Oyen