US PATENT SUBCLASS 415 / 57.1
.~ Plural, independent, serially acting re-entry means

Current as of: June, 1999
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415 /   HD   ROTARY KINETIC FLUID MOTORS OR PUMPS

52.1  DF  WITH MEANS FOR RE-ENTRY OF WORKING FLUID TO BLADE SET (E.G., RE-ENTRY TYPE DEVICE, PASSAGE, ETC.) {11}
57.1.~ Plural, independent, serially acting re-entry means {3}
57.2  DF  .~.~> Having additional blade set in re-entry path
57.3  DF  .~.~> Re-entry from opposite sides of blade face
57.4  DF  .~.~> Re-entry into blade in radial plane of blade

DEFINITION

Classification: 415/57.1

Plural, independent, serially acting reentry means:

(under subclass 52.1) Device having two or more such (reentry) means each separately directing working fluid* which has previously contacted the first runner* blade* or blade row back to the blade or blade row. The two or more means act in sequence (i.e., one after the other) on the working fluid flowing through the device.