US PATENT SUBCLASS 418 / 202
.~.~ Each member having opposed axially spaced helices

Current as of: June, 1999
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418 /   HD   ROTARY EXPANSIBLE CHAMBER DEVICES

191  DF  INTERENGAGING ROTATING MEMBERS {9}
201.1  DF  .~ Helical or herringbone {4}
202.~.~ Each member having opposed axially spaced helices

DEFINITION

Classification: 418/202

(under subclass 201.1) Apparatus in which each rotating member includes axially spaced ribs or grooves extending thereabout in reverse directions.