US PATENT SUBCLASS 285 / 309
.~.~ With means to increase contact pressure (e.g., tightener)

Current as of: June, 1999
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285 /   HD   PIPE JOINTS OR COUPLINGS

305  DF  ESSENTIAL CATCH {7}
308  DF  .~ With manipulator {4}
309.~.~ With means to increase contact pressure (e.g., tightener) {3}
310  DF  .~.~.~> Separate actuator
311  DF  .~.~.~> Dead center lever systems (self-locking)
312  DF  .~.~.~> Cam lever

DEFINITION

Classification: 285/309

(under subclass 308) Subject matter comprising means to draw the ends of the coupled members toward each other.