US PATENT SUBCLASS 285 / 351
.~ Plural seals

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

335  DF  PACKED {20}
351.~ Plural seals {1}
352  DF  .~.~> Coacting opposed duplicates

DEFINITION

Classification: 285/351

(under subclass 335) Subject matter comprising two or more means to seal a single joint.

SEE OR SEARCH THIS CLASS, SUBCLASS:

95+, for a fluid pressure responsive seal in combination with other sealing means.

148.6+, for compound joints.