03974508 is referenced by 47 patents and cites 3 patents.

Pulsed droplet ejecting systems are described of the type in which a conduit conducts liquid from a reservoir to an orifice. The liquid is under zero or slightly negative pressure, and surface tension in the orifice prevents flow in the absence of other forces. An electroacoustic transducer is coupled to the liquid and when an electric pulse is applied a pressure wave travels in the liquid to the orifice causing ejection of a droplet of liquid. Systems of this type work well only when free of entrapped air, a condition difficult to achieve in prior art designs. Means are disclosed for readily and reliably filling such systems without entrapment of air pockets. A second conduit is permanently or temporarily joined to the first conduit adjacent to or in place of the orifice, and means are provided for temporarily causing rapid flow of liquid from the reservoir through the first conduit into and through the second conduit. The conduits have sufficiently large cross sections so that the flow can be fast enough to sweep out all air pockets that might otherwise remain if flow during filling the system were through a single conduit and out a typical small orifice.

Title
Air purging system for a pulsed droplet ejecting system
Application Number
5/532865
Publication Number
3974508
Application Date
December 16, 1974
Publication Date
August 10, 1976
Inventor
John Blumenthal
Wickliffe
OH, US
Agent
Eber J Hyde
Assignee
Gould
IL, US
IPC
G01D 15/18
View Original Source