Liquid material dispenser
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United States of America Patent
Stats
-
Sep 21, 1993
Issued Date -
N/A
app pub date -
Jul 13, 1992
filing date -
May 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A liquid material dispenser includes a housing formed with a reservoir for the liquid to be dispensed, an outlet through which the liquid is to be dispensed, and a connecting passageway between the reservoir and the outlet. A diaphgram is located in a cavity in the passageway such that one side of the diaphragm defines a pumping chamber, and the other side defines a control chamber. An electrolytic cell generates a gas to the control chamber according to the quantity of electrical current passed through the electrolyte, for driving the diaphragm through forward strokes to pump liquid to the outlet; and a slow-acting vent vents the gas from the control chamber to the atmosphere at a rate lower than that of generation of gas by the electrolytic cell, for driving the diaphragm through return strokes to refill the pumping chamber.
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