Patents by Inventor John P. Silbernagel

John P. Silbernagel 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).

  • Blood pump system
    Patent number: 4363609
    Abstract: A blood pump system in which a roller pump is provided for pumping blood through a flexible tube. A low voltage D.C. motor is provided having an output shaft. An electrical control circuit is connected to the motor for applying the necessary voltage to drive the motor at a predetermined speed. Gearing means are provided connecting the motor's output shaft to drive the roller pump. Means are optically coupled to the motor for controlling the speed of the motor. Means are connected to the optically coupled means to determine the blood flow rate being pumped though the tube by the pump. Means are provided which display a digital readout of the flow rate. The roller pump is provided with an arcuate bearing surface, which carries the flexible tube, the bearing surface defining an arc of approximately 168.degree.. Lead ramps extend from each end of the bearing surface and are substantially tangent to the end of the surface from which the respective ramp extends.
    Type: Grant
    Filed: January 23, 1980
    Date of Patent: December 14, 1982
    Assignee: Renal Systems, Inc.
    Inventors: Louis C. Cosentino, Bill H. Niemi, John P. Silbernagel, Jamshed R. Cooper
  • Bloom pump system
    Patent number: 4221543
    Abstract: A blood pump system in which a roller pump is provided for pumping blood through a flexible tube. A low voltage D.C. motor is provided having an output shaft. An electrical control circuit is connected to the motor for applying the necessary voltage to drive the motor at a predetermined speed. Gearing means are provided connecting the motor's output shaft to drive the roller pump. Means are optically coupled to the motor for controlling the speed of the motor. Means are connected to the optically coupled means to determine the blood flow rate being pumped through the tube by the pump. Means are provided which display a digital readout of the flow rate. The roller pump is provided with an arcuate bearing surface, which carries the flexible tube, the bearing surface defining an arc of approximately 168.degree.. Lead ramps extend from each end of the bearing surface and are substantially tangent to the end of the surface from which the respective ramp extends.
    Type: Grant
    Filed: November 7, 1977
    Date of Patent: September 9, 1980
    Assignee: Renal Systems, Inc.
    Inventors: Louis C. Cosentino, Bill H. Niemi, John P. Silbernagel, Jamshed R. Cooper
  • Enclosed push button type switch
    Patent number: 4121070
    Abstract: An enclosed push button switch in which movable and fixed contact members are mounted on the switch frame, the assembly being enclosed by a protective covering which is deformable on the upper surface thereof and in contact with the movable contact member of the switch to permit operation of the same through the cover.
    Type: Grant
    Filed: March 4, 1977
    Date of Patent: October 17, 1978
    Assignee: Renal Systems, Inc.
    Inventor: John P. Silbernagel