Patents by Inventor Robin A. Sinclair

Robin A. Sinclair 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).

  • H.sub.2 S indicator
    Patent number: 4019865
    Abstract: The prolonged attainment of high concentrations of H.sub.2 S in a gaseous environment is indicated by a device which comprises a base, an enclosing upper surface which is transparent and water impenetrable, and a light stable composition enclosed by the base and upper surface, said composition undergoing a visible change in color or tone when exposed to a constant concentration of 1 part per million of H.sub.2 S for one day.
    Type: Grant
    Filed: February 13, 1976
    Date of Patent: April 26, 1977
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robin A. Sinclair, Eileen A. Glasspoole