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Class Information
Number: 417/147
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 > Cyclic pumping > Correlated supply - exhaust of motive fluid or vacuum generating means > Unitary supply - exhaust valve
Description: Apparatus wherein said valve means comprises a single valve member to control both supply and exhaust.

Patents under this class:

Patent Number Title Of Patent Date Issued
7007456 Dual chamber pump and method Mar. 7, 2006
6234761 Apparatus for an air lift and transfer pump May. 22, 2001
4770611 Product pump assembly Sep. 13, 1988
4678040 Methods and apparatus for recovery of hydrocarbons and other liquids from underground Jul. 7, 1987
4625801 Methods and apparatus for recovery of hydrocarbons from underground water tables Dec. 2, 1986
4546830 Methods and apparatus for recovery of hydrocarbons from underground water tables Oct. 15, 1985
4527633 Methods and apparatus for recovery of hydrocarbons from underground water tables Jul. 9, 1985
4321017 Pneumatic ejector control Mar. 23, 1982
4094616 Steam-heater-pump Jun. 13, 1978
4092087 Air operated pump May. 30, 1978
4083661 Pneumatic sewage ejector Apr. 11, 1978
4025237 Latching magnetic level sensor May. 24, 1977
4021147 Gas pressure driven pump May. 3, 1977

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