US PATENT SUBCLASS 417 / 118
.~ Liquid pumped by supplying or exhausting gaseous motive fluid to or from pumping chamber

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
118.~ Liquid pumped by supplying or exhausting gaseous motive fluid to or from pumping chamber {7}
119  DF  .~.~> Motive fluid pumped by contact with a liquid
120  DF  .~.~> With condition responsive control of motive fluid vacuum or pressure generating means
121  DF  .~.~> Serially connected pumping chambers
122  DF  .~.~> Alternate pumping from plural pumping chambers {1}
126  DF  .~.~> With float actuated control means {5}
137  DF  .~.~> Cyclic pumping {5}
148  DF  .~.~> With vacuum generator {1}

DEFINITION

Classification: 417/118

(under subclass 65) Apparatus in which the fluid which is to be pumped is a liquid, and the motive fluid is a gas, comprising a pumping chamber, a liquid inlet and a liquid outlet through which the liquid is pumped into and out of said chamber, means for supplying and exhausting the gas to effect the pumping of said liquid, and further having (1) pump means to supply or exhaust the gas or (2), liquid level float means to effect control of the gas or liquid entering or leaving said chamber or (3) means to effect repetitive or cyclic pumping into and from said chamber upon initiation of the pumping action.

(1) Note. The pumps disclosed in the patents contained herein operate on a differential pressure principle, i.e., by withdrawing the gaseous motive fluid which is in contact with a portion of a confined liquid to be pumped, a higher pressure, e.g., atmospheric, acting upon another portion of said confined liquid effects movement and thus pumping thereof.

(2) Note. Devices are included under this definition wherein the pumping chamber is provided with a single means by which both the liquid and the gas are exhausted.

(3) Note. Devices are classified under this definition which have pumping chambers which are submerged in the liquid to be pumped whereby the liquid is introduced into the chamber by gravity.