Patents Assigned to The United States of America as represented by the Scretary of the Department of Health
  • Quick color test to detect lead release from glazed ceramic and enameled metal ware
    Patent number: 4873197
    Abstract: A color test is presented for the purpose of quickly identifying glazed ceramic and/or enameled metal ware which releases excessive Pb. Citric acid solution on filter paper is used to extract Pb from the ware and a Pb sensitive chromogen indicates the presence of Pb on the paper. The quick color test takes approximately 30 minutes and is useful for screening ware for testing by the 24 hour AOAC/ASTM method.
    Type: Grant
    Filed: October 28, 1988
    Date of Patent: October 10, 1989
    Assignee: The United States of America as represented by the Scretary of the Department of Health
    Inventor: John H. Gould