US PATENT SUBCLASS 166 / 84.4
.~.~ Fluid pressure actuated seals

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


166 /   HD   WELLS

75.11  DF  ABOVE GROUND APPARATUS {25}
84.1  DF  .~ With seal for reciprocating member {4}
84.4.~.~ Fluid pressure actuated seals

DEFINITION

Classification: 166/84.4

Fluid pressure actuated seals:

(under subclass 84.1) Reciprocating member seal wherein the flow prevention device is moved to a pipe engaging position by liquid or gas force.