Patents by Inventor Lydia Johnson

Lydia Johnson 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 and device for determining monopersulfate
    Patent number: 6255117
    Abstract: A test method and device are described for quantitatively determining the presence and concentration of monopersulfate ion in aqueous solution. Contacting the aqueous solution containing monopersulfate ion with a test strip in accordance with the invention produces a color change in proportion to the concentration of the ion. The invention has particular utility in maintaining the proper level of sanitizers in swimming pool water.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: July 3, 2001
    Assignee: Lamotte Company
    Inventor: Lydia Johnson