04877745 is referenced by 140 patents and cites 49 patents.

This invention relates to a system for printing and dispensing chemical reagents in precisely controlled volumes onto a medium at a precisely controlled location. A jetting tube, comprising an orifice at one end and a fluid receiving aperture at the other end, is concentrically mounted within a cylindrical piezo-electric transducer. The fluid receiving aperture is connected to a reservoir containing a selected reagent by means of a filter. The reservoir may be pressurized by a regulated air supply. An electrical signal of short duration is applied to the transducer. The pulse causes the transducer and the volume defined by the jetting tube to expand, thereby drawing in a small quantity of reagent fluid. The cessation of the pulse causes the transducer and the volume of the jetting tube to de-expand, thereby causing at least a substantially uniformly sized droplet of reagent fluid to be propelled through the orifice. The droplet may be directed to impact a printing medium or collected in a dispensing recepticle.

Title
Apparatus and process for reagent fluid dispensing and printing
Application Number
931476
Publication Number
4877745
Application Date
March 14, 1989
Publication Date
October 31, 1989
Inventor
Kenneth R Houseman
Racine
WI, US
Donald J Verlee
Libertyville
IL, US
David B Wallace
Dallas
TX, US
Donald J Hayes
Plano
TX, US
Agent
Edward H Gorman Jr
Rodney A Daniel
Thomas D Brainard
Assignee
Abbott Laboratories
IL, US
IPC
G01N 21/75
G01N 1/10
G01D 15/16
G01D 9/00
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