Patents by Inventor Charles W. Gardner, Jr.

Charles W. Gardner, Jr. 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).

  • Device for monitoring hydrocarbons in groundwater
    Patent number: 4818976
    Abstract: An apparatus for sensing the leakage of hydrocarbons from underground storage tanks having a hydrocarbon vapor sensor, a liquid sensor to determine the level of the groundwater and the positioning of the vapor sensor; and, alarm and trouble circuitry to indicate the presence of a hydrocarbon leak or a malfunctioning circuit. The apparatus also contains a timer mechanism to accurately determine whether or not the hydrocarbon has actually leaked from an underground storage tank or is present in the test area due to natural gases or above-ground spills.
    Type: Grant
    Filed: February 26, 1987
    Date of Patent: April 4, 1989
    Assignee: Mine Safety Appliances Company
    Inventors: Paul W. Schmitt, Charles W. Gardner, Jr.