Patents by Inventor Stig T. H. Lofgren

Stig T. H. Lofgren 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).

  • Leakage detector using slotted insulated conductors
    Patent number: 5084679
    Abstract: A detector for use in a detecting device determines the occurrence of a change in the conductivity of a medium includes electrical conductors. The respective electrically insulated conductors are prepared at predetermined, restricted locations thereon in order to expose parts of the conductor material. The electrical conductors are provided as two or more twined or twisted conductors which are electrically insulated from one another. The electrically insulated layer is removed from the outermost parts of the conductors with the aid of a mechanical working process.
    Type: Grant
    Filed: November 28, 1990
    Date of Patent: January 28, 1992
    Inventor: Stig T. H. Lofgren