US PATENT SUBCLASS 166 / 232
.~.~ With spacing lug for adjacent turns


Current as of: June, 1999
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166 /   HD   WELLS

227  DF  SCREENS {7}
231  DF  .~ Spiral {2}
232.~.~ With spacing lug for adjacent turns


DEFINITION

Classification: 166/232

(under subclass 231) Devices in which the helical element is provided with spaced lugs to engage an adjacent turn of the element in order to position the turns to form straining openings.

(1) Note. The spaced lugs may be formed by spaced recesses in the edge of the helical element.