Patents by Inventor Spencer M. Fields

Spencer M. Fields 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).

  • 4-Aminoantipyrine dye for the analytic determination of hydrogen peroxide
    Patent number: 4321397
    Abstract: A 3-aminobenzoic acid or a 3-aminobenzenesulfonic acid, when reacted with a 4-aminoantipyrine in aqueous medium in the presence of hydrogen peroxide forms a novel colored dye which is believed to be a charge-transfer complex of free radicals formed from the 3-aminoaromatic acid and the 4-aminoantipyrine. The dye and the process by which it is produced are useful in analytical procedures for hydrogen peroxide, as well as in enzymatic analyses involving the formation of hydrogen peroxide.
    Type: Grant
    Filed: February 20, 1980
    Date of Patent: March 23, 1982
    Assignee: Millipore Corporation
    Inventors: Paul T. Nix, Spencer M. Fields