Patents by Inventor David A. Griffiths

David A. Griffiths 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).

  • Colorimetric enzymic analysis
    Patent number: 5527509
    Abstract: A colorimetric enzymic analytical test element comprises a support and a plurality of reaction zones incorporating a dried enzyme composition, dyestuff and reagent adapted to provide a substantial dosage independent colorimetric display when the concentration of an analyte applied to the elements exceeds a predetermined value.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: June 18, 1996
    Assignee: Cranfield Biotechnology Ltd.
    Inventors: Timothy D. Gibson, John R. Woodward, Irving J. Higgins, William J. Aston, David A. Griffiths