Patents by Inventor Kurt Lehnhoff

Kurt Lehnhoff 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: 5324090
    Abstract: A windshield cover for protecting the windshield of motor vehicles against the weather i made as a panel constructed of a plastic material. The panel has two outer sheets spaced from each other by a spacing and a plurality of inner webs extending perpendicularly to the outer sheets and interconnecting the two outer sheets to form a channeled panel fairly rigid against a force perpendicularly to the plane of the panel and somewhat flexible to bending around the length of the webs which form a plurality of parallel channels in said spacing between the outer sheets. The inner webs provide mechanical strength against rough wear and tear, and the channels hold air for thermal insulation, especially when at least the upper end of each channel is closed.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: June 28, 1994
    Inventor: Kurt Lehnhoff
  • Patent number: 4243530
    Abstract: A haemofiltration apparatus includes a combined blood pump (1a) and filtrate pump (1b). The pressure on the inlet side of the filtrate pump may be adjusted by a cone valve (14) mounted on a diaphragm (12) which opens to admit air when the inlet pressure falls below a predetermined value which is set by a valve spring (16) provided with an adjustment screw (15). The other side of the diaphragm may be connected to the atmosphere or to an air trap (6) in the blood pump circuit.
    Type: Grant
    Filed: December 4, 1978
    Date of Patent: January 6, 1981
    Assignee: Dr. Eduard Fresenius Chemisch-pharmazeutische Industrie KG, Apparatebau KG
    Inventors: Kurt Lehnhoff, Wilfried Schael