US PATENT SUBCLASS 418 / 201.1
.~ Helical or herringbone

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

191  DF  INTERENGAGING ROTATING MEMBERS {9}
201.1.~ Helical or herringbone {4}
201.2  DF  .~.~> With valve
201.3  DF  .~.~> Having specific tooth shape
202  DF  .~.~> Each member having opposed axially spaced helices
203  DF  .~.~> Axially counterbalanced

DEFINITION

Classification: 418/201.1

Helical or herringbone:

(under subclass 191) Apparatus wherein the surface portions of the interengaging rotary member are formed with intermeshing teeth or ribs and grooves, the teeth or ribs and grooves being in the form of a helix or discontinuous, angularly related, straight line segment (i.e., herringbone shape).