Patents by Inventor Leif A. Unruh

Leif A. Unruh 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: 5382908
    Abstract: Cell (19) for measuring moisture content of a material, comprising a sock (13) which is comprised of a plurality of braided threads, each thread consisting of a plurality of fibers comprised of an electrically non-conductive material. The sock is perfused with a moisture absorbing fluid. The sock comprises at least two electrodes (15, 17) in the form of wires comprised of a conducting material. These electrodes are braided as longitudinal threads in the sock (13). The electrodes are spaced from each other and extend essentially parallel to each other, the sock (13) being braided around a cylindrical core (11) comprised of an electrically non-conducting material. The axis of the core is essentially parallel to the electrodes (15, 17) and the threads in the sock (13) are permanently under tension to achieve contact between the threads and the electrodes (15, 17).
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: January 17, 1995
    Assignee: Bo Gosta Forsstrom
    Inventors: Bo G. Forsstrom, Per E. Wikefeldt, Leif A. Unruh
  • Patent number: 4810957
    Abstract: A device for sensing the number of items (14) consecutively disposed in a compartment (12), preferable bottles or cans disposed in a beverage magazine (13) in a refrigerator (10). At each item (14) at opposite sides of said item electric conducting areas (20a,b,c;21a,b,c) are provided which form a capacitor (22a,b,c). The capacitors formed in each compartment are interconnected to form a circuit (C.sub.k) the capacitance of which depends on the number of items (14) in the compartment (12).
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: March 7, 1989
    Assignee: Aktiebolaget Electrolux
    Inventors: Jan R. Rubbmark, Leif A. Unruh, Bjorn L. G. Bjernstad, Nils E. H. Olsson, Mariusz Gerlach
  • Patent number: D321212
    Type: Grant
    Filed: November 18, 1987
    Date of Patent: October 29, 1991
    Assignee: Aktiebolaget Electrolux
    Inventor: Leif A. Unruh