US PATENT SUBCLASS 267 / 124
.~.~ Piston

Current as of: June, 1999
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267 /   HD   SPRING DEVICES

113  DF  FLUID {5}
118  DF  .~ Expansible-contractible chamber device {5}
124.~.~ Piston {4}
125  DF  .~.~.~> For use in well drilling or operating
126  DF  .~.~.~> System {1}
128  DF  .~.~.~> Rigid-material-spring impelled
129  DF  .~.~.~> Seal

DEFINITION

Classification: 267/124

(under subclass 118) Spring device in which the side wall structure defines a cylinder and the displaceable wall is a rigid member movable along and in substantially sealing proximity to said wall structure interior.