US PATENT SUBCLASS 285 / 397
INTERNAL SLEEVE

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

397INTERNAL SLEEVE {1}
398  DF  .~> With external

DEFINITION

Classification: 285/397

(under the class definition) Subject matter united by a short tubular section inside the ends of the coupled members.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53, for insulated sleeve joints.

300, for an internal sleeve within a flexible bellows seal of a variable length joint.

370+, for packed joints including an internal sleeve.

SEE OR SEARCH CLASS

403, Joints and Connections, 292+, for two members joined by an inserted section.