Patents by Inventor W. James Woodford

W. James Woodford 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).

  • Method for detecting tetrahydrocannabinol in human urine involving melanin precipitation
    Patent number: 4843020
    Abstract: An improved method for the detection of tetrahydrocannabinol in human urine wherein the pigment melanin is precipitated out of the urine prior to analysis with a solution of nitroferricyanide so that the melanin does not interfere with the analysis. The value attributable to melanin can also be subtracted from the value obtained during the analysis of the urine. The precipitation of melanin prior to analysis or subtraction of the melanin value during analysis greatly reduces the occurrence of false positive test results for persons with dark skin.
    Type: Grant
    Filed: January 14, 1988
    Date of Patent: June 27, 1989
    Inventor: W. James Woodford