US PATENT SUBCLASS 418 / 197
.~.~ Helical or herringbone

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

191  DF  INTERENGAGING ROTATING MEMBERS {9}
196  DF  .~ Three or more {1}
197.~.~ Helical or herringbone

DEFINITION

Classification: 418/197

(under subclass 196) Apparatus in which the peripheral surfaces of the interengaging rotary members are formed with intermeshing teeth or ribs and grooves either in the form of a helix or discontinuous, angularly related, straight line segments (i.e., herringbone shape).