Pipette

Details Pipette Pipette

1979-08-30

1981-04-21

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

734254P, 734256, B01L 302, G01N 114

Patent

active

042632579

ABSTRACT:
A pipette having a frame part with a cylinder formed thereinside, a piston slidable in said cylinder and gasketed in relation thereto, a spring urging the piston towards its upper rest positition, and separate filling and emptying press-buttons provided to press said piston downwards in connection with filling and emptying the pipette respectively, the filling and emptying press-buttons being provided with movement limiting members related thereto in such manner that the piston can be pressed to a lower level by emptying press-button than by the filling press-button. The press-buttons may be arranged in such way that in their rest position the emptying press-button is at a slightly higher level than the filling press-button and that both buttons can be pressed down to essentially the same level.

REFERENCES:
patent: 2869542 (1959-01-01), Orsten
patent: 3340872 (1967-09-01), Cox
patent: 3591056 (1971-07-01), Griffin
patent: 3646817 (1972-03-01), Hinchman et al.
patent: 3810391 (1974-05-01), Suovaniemi
patent: 3827305 (1974-08-01), Gilson
patent: 3855868 (1974-12-01), Suovaniemi
patent: 4144761 (1979-03-01), Dzaack

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