Pipette

US7421913B2 · kind B2 · utility

Assignee

• Eppendorf AG · DE

Inventors

• Herbert Belgardt · Hamburg, DE
• Peter Molitor · Andale, US
• Bernd Jagdhuber · Uetersen, DE

Key dates

• Filing date: Apr 21, 2005
• Grant date: Sep 9, 2008
• Expiry date: Nov 4, 2025

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01L2200/146
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Pipette having an axially relocatable control button, a pressure sensor, which is integrated into the control button, a lifting rod, coupled with the control button and having a stopping bead, a hollow driving spindle, accommodating the lifting rod and being axially relocatable, a twisting lock, preventing the driving spindle from being twisted, a turnable driving nut having screw thread engagement with the driving spindle, an axial support of the driving nut, an electric driving motor with a motor shaft, a gear between the motor shaft and the driving nut, an electric power supply, an electric control system, connected to the pressure sensor, the electric driving motor and the electric power supply, which provides an electric voltage to the electric driving motor upon a push on the control button which is indicated by the pressure sensor, so that the motor relocates the driving spindle via the gear in the direction of a relocation of the control button by the push, the driving spindle taking the lifting rod along with it on its stopping bead, a plunger, coaxially displaceable with respect to the lifting rod, a cylinder, connected to an opening which leads outward and in which the p…