Patents Assigned to David Kopf Systems
  • Proportioning system
    Patent number: 4082667
    Abstract: A proportioning system is provided for mixing dialysate used in an artificial kidney machine. A first conduit carries concentrate solution in a recirculating loop pattern. A second conduit carrying water intersects the first conduit. At the point of intersection, the first conduit has an orifice for discharging concentrate into the flowing water. Concentrate is supplied to the first conduit through a supply line immersed in a storage jug. The supply line has a pressure-operated check valve through which concentrate passes only when required.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: April 4, 1978
    Assignee: David Kopf Systems
    Inventor: William Seiler, Jr.
  • Magnetic pump
    Patent number: 3986797
    Abstract: A pump is provided in which the fluid being pumped is used to lubricate the moving parts of the pump and the flow path of the fluid through the pump insures that at least a portion of the fluid circulates around the moving parts of the pump to assure efficient lubrication and rapid flushing of the pump. The pump is driven by a pair of concentric magnets, the interior magnet being sealed off relative to the outer magnet.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: October 19, 1976
    Assignee: David Kopf Systems
    Inventor: J. David Kopf