Patents by Inventor Francis C. Sparling

Francis C. Sparling 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).

  • Patent number: 4843327
    Abstract: A detection and location system, e.g. liquid leaks, comprising a trunk line sensor cable and at least one branch line cable; each of the cables comprise two insulated conductors and two non-insulated conductors which are not connected to each other in the absence of a leak but which become connected upon occurrence of a leak. In the trunk line cable, the insulated conductors form part of a circuit which enables the location of a leak to be detected. In the branch line, one of the insulated conductors and one of the non-insulated conductors are connected so as to form a loop connecting the ends of the non-insulated conductors of the branch cable.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: June 27, 1989
    Assignee: Raychem Corporation
    Inventors: Heinrich Koppitsch, Francis C. Sparling