US PATENT SUBCLASS 417 / 488-- .~.~.~ Form opposite chamber walls

US PATENT SUBCLASS 417 / 488
.~.~.~ Form opposite chamber walls

Current as of: June, 1999
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417 /	HD	PUMPS

437	DF	EXPANSIBLE CHAMBER TYPE {40}
486	DF	.~ Plural pumping members in single pump chamber {1}
487	DF	.~.~ Coaxial reciprocating pumping members {1}
488		.~.~.~ Form opposite chamber walls

DEFINITION

Classification: 417/488

(under subclass 487) Apparatus in which the pumping members form opposing walls of said chamber.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

501, for three or more cylinders arranged in parallel, radial or conical relationship with a rotary transmission axis with oppositely moving pistons in each cylinder.

92, Expansible Chamber Devices,

69+, for an expansible chamber device having relatively movable working members interconnected with a common rotatable shaft and forming oppositely movable walls of a common chamber, and subclass 75, for working members forming oppositely movable walls of a common chamber.