Patents Assigned to WRS and Associates
  • Color test card package for testing for the presence of lead
    Patent number: 6225128
    Abstract: A package comprises a sealed plastic envelope containing a small amount of desiccant sufficient to absorb the moisture in the air entrapped in the envelope. The package contains a dry test card having at least one circular area coating of a dry solid rhodizonic acid dipotassium chromogen salt free of any solvent.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: May 1, 2001
    Assignee: WRS and Associates
    Inventor: Kenneth T. White