35.
    发明专利
    未知

    公开(公告)号:DE69618715T2

    公开(公告)日:2002-08-29

    申请号:DE69618715

    申请日:1996-06-06

    Abstract: A fluid is aspirated from a sealed container (12) and a precise quantity of the aspirated fluid is dispensed. The method involves standard steps of inserting a probe (20 into the container (12) through the container seal (14) and aspirating bubbles and the selected quantity of fluid into the probe before removing the probe from the container and dispensing the fluid. The method also includes an additional step performed at at least one stage in the method to assure that, before the dispensing operation is performed, sample fluid in the probe extends to the end of the probe without any fluid extending beyond the end of the probe. For one embodiment of the invention, both the selected quantity of fluid to be dispensed and a selected extra volume of fluid are initially aspirated and, prior to the dispensing step, a selected quantity of the sample which is greater than the maximum amount that air bubbles in the probe might shrink as a result of the pressure in the container being less than the pressure outside the container, but less than the selected extra volume, is wasted. An additional step might be to withdraw a volume of fluid from the probe before the probe is inserted into the container which is substantially equal to the fluid and air bubbles to be aspirated, such fluid being replaced by air entering the probe and then dispensing such volume of air from the probe into the container after the probe has been inserted into the container. A hollow needle (18) may also be inserted into the container prior to the aspiration operation to equalize the pressure inside and outside the container before the above step is performed or, the pressure and air volume in the container may be determined and used to calculate the change in air volume of air bubbles which will occur when the probe is removed from the container and this information used to compensate for such increase or shrinkage when fluid is removed from the probe prior to insertion into the container and when air from the probe is injected into the container after insertion.

    36.
    发明专利
    未知

    公开(公告)号:AT104055T

    公开(公告)日:1994-04-15

    申请号:AT90900482

    申请日:1989-11-16

    Abstract: Optical encoding of a cuvette or other object is provided by means of multiple facets molded integrally into flanges or other portions of the object, which facets selectively refract light passing therethrough in accordance with a predetermined code. The detector for the coded light includes a separate detector for each code state of the facets, with the detector having a different output when no facets are between a light source and the detectors. The facets are preferably bevels, which are selectively angled in accordance with the code.

    A PIPETTE
    39.
    发明专利

    公开(公告)号:IE42303B1

    公开(公告)日:1980-07-16

    申请号:IE38176

    申请日:1976-02-26

    Abstract: A mechanical pipette having a fixed stroke for aspirating and discharging a predetermined volume of liquid into and from a reservoir. A measuring piston controls the volume of liquid drawn into the reservoir and a substantially larger piston assures that all of the liquid in the reservoir is expelled therefrom on a discharge stroke. On the discharge stroke, a mechanically actuated valve is opened to admit air being compressed by the substantially larger piston into the reservoir.

    40.
    发明专利
    未知

    公开(公告)号:CH615364A5

    公开(公告)日:1980-01-31

    申请号:CH233376

    申请日:1976-02-25

    Inventor: KEEGAN WILLIAM P

    Abstract: A mechanical pipette having a fixed stroke for aspirating and discharging a predetermined volume of liquid into and from a reservoir. A measuring piston controls the volume of liquid drawn into the reservoir and a substantially larger piston assures that all of the liquid in the reservoir is expelled therefrom on a discharge stroke. On the discharge stroke, a mechanically actuated valve is opened to admit air being compressed by the substantially larger piston into the reservoir.

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