US PATENT SUBCLASS 505 / 911
.~ Fluid reaction surface (i.e., impeller): (Class 416)


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505 /   HD   SUPERCONDUCTOR TECHNOLOGY: APPARATUS, MATERIAL, PROCESS

825  DF  APPARATUS, PER SE, DEVICE, PER SE, OR PROCESS OF MAKING OR OPERATING SAME {36}
911.~ Fluid reaction surface (i.e., impeller): (Class 416)


DEFINITION

Classification: 505/911

Fluid reaction surface (i.e., impeller): (Class 416):

(under subclass 825) Subject matter including a working structure which interacts with a working fluid so as to cause reactive movement of the working structure or, alternatively, reactive movement of the working fluid.