US PATENT SUBCLASS 285 / 291.1
.~ Having screw interlock

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

285.1  DF  MOLDED JOINT {11}
291.1.~ Having screw interlock {1}
291.2  DF  .~.~> Having interrupted thread

DEFINITION

Classification: 285/291.1

Having screw interlock:

(under subclass 285.1) Subject matter wherein the ends of the members are additionally held together by means having a helical thread.