One fluid pumped by contact or entrainment with another > Liquid pumped by supplying or exhausting gaseous motive fluid to or from pumping chamber > With float actuated control means > Control of motive fluid outlet > With control of pumped fluid outlet > Patents

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Class Information
Number: 417/135
Name: Pumps > One fluid pumped by contact or entrainment with another > Liquid pumped by supplying or exhausting gaseous motive fluid to or from pumping chamber > With float actuated control means > Control of motive fluid outlet > With control of pumped fluid outlet
Description: Apparatus wherein said buoyant means further controls the flow of fluid which is pumped from the pumping chamber.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
6244828	Pump and combination pump and trap with snap-over mechanism and double-seal outlet valve	Jun. 12, 2001
5938409	Gas powered fluid pump with exhaust assist valve	Aug. 17, 1999
5401142	Condensate discharging device	Mar. 28, 1995
5366349	Automatic liquid pump with vapor flow prevention flow outlet valve	Nov. 22, 1994
4842487	Pumping device using pressurized gas	Jun. 27, 1989
4828461	Apparatus for metering flowable materials in sand core making machines	May. 9, 1989
4770610	Frail material slurry pump	Sep. 13, 1988