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US 5,343,769 AGranted
Procedure for filling and emptying a pipette, and pipette
AssigneeBiohit Oy
InventorsOsmo Suovaniemi, Pertti Ekholm
Life of this patent
Estimating the term…
Abstract
A procedure for filling and emptying a pipette with quantative accuracy, wherein the distance travelled by a plunger (3) is measured as the plunger is being moved and the plunger is arrested when the travel corresponding to the desired quantity of liquid to be transferred has been reached, and a pipette comprising a elements (14, 23, 24) for measuring the travel of the plunger (3) and a elements (13) for controlling the movements of the plunger.
Claims4
A pipette comprising:
- a cylinder volume (4);
- a plunger which is fitted into said cylinder volume, said plunger being reciprocatingly movable within said cylinder volume;
- a liquid volume (6) communicating with said cylinder volume;
- operating means (8,9a,9b) for moving said plunger in said cylinder volume and for filling and emptying said pipette with quantitative accuracy when said plunger is moved, said operating means including a threaded rod and sleeve assembly in communication with said plunger;
- measuring means (14,23,24) for measuring the distance travelled by said plunger;
- control means (13) for controlling the movement of said plunger;
- and brake means (21) for arresting said plunger, said brake means acting on said threaded and sleeve assembly, said brake means being operatively connected to said control means.
4 more elements
Dependencies are inferred from the claim text.