Patent Number: 6,254,832

Title: Battery powered microprocessor controlled hand portable electronic pipette

Abstract: A battery powered, microprocessor controlled portable electronic pipette, comprising a hand holdable housing supporting a battery, a linear actuator for driving a plunger lengthwise in a cylinder to aspirate and dispense fluid into and from a pipette tip extending from the housing and a control circuit for the linear actuator. The linear actuator is powered by the battery and comprises a stepper motor with current receiving windings for electromagnetically driving a rotor to impart the lengthwise movement to the plunger. The control circuit includes (i) a user controllable microprocessor powered by the battery and programmed to generate drive signals for the stepper motor, (ii) a display supported by the housing and electrically connected to the microprocessor, (iii) user actuateable control keys supported by the housing and electrically connected to the microprocessor for generating within the microprocessor pipette mode of operation, liquid pick up volume, liquid dispense, pipette speed of operation and pipette reset signals for controlling operation of the pipette and alpha-numeric user readable displays on the display, (iv) a memory having tables of data stored therein and accessible and useable by the microprocessor to control operations of the pipette, and (v) user actuateable switches supported by the housing for triggering pipette operations selected by user actuation of the control keys.

Inventors: Rainin; Kenneth (Piedmont, CA), Kelly; Christopher (Larkspur, CA), Magnujssen, Jr.; Haakon T. (Orinda, CA), Homberg; William D. (Oakland, CA)

Assignee: Rainin Instrument Co., Inc.

International Classification: B01L 3/02 (20060101); B01L 003/02 (); G01N 001/14 ()

Expiration Date: 07/03/2018