Patents Assigned to Glasgeratebau Hirschmann
  • Patent number: 4784834
    Abstract: A pipette including an expansible chamber defined by an elastic bellows or a piston and a cylinder provided with a pressure equalizing vent.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: November 15, 1988
    Assignee: Glasgeratebau Hirschmann
    Inventor: Adolf M. Hirschmann
  • Patent number: 4526294
    Abstract: A dispenser for dispensing controlled quantities of liquid from a bottle includes a piston, which is movable in a cylinder and serves to suck and discharge an adjustable quantity of liquid. The cylinder is secured to a valve block, which contains a suction valve and a discharge valve. A cylindrical sleeve surrounds the cylinder and defines an annular clearance therewith. To change the length of the stroke of the piston and the quantity of liquid which is to be sucked and discharged depends on the stroke length, an adjustable stop and a fixed stop, which is engageable with the adjustable stop and are accommodated in the clearance.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: July 2, 1985
    Assignee: Glasgeratebau Hirschmann
    Inventors: Adolf M. Hirschmann, Klaus Kaser, Hans Rieker, Hans-Peter Busch, Willi Rathke, Heinz P. Maul