US PATENT SUBCLASS 220 / 328
.~.~.~ With retainer

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
315  DF  .~ Having means for securing or retaining closure in its closed position (e.g., fastening devices) {8}
327  DF  .~.~ Threaded member (e.g., stud, bolt, or screw) {1}
328.~.~.~ With retainer

DEFINITION

Classification: 220/328

(under subclass 327) Device where in some additional means other than threads of the threaded members interposed between the closure and fastening means to prevent displacement from and/or maintain sufficient pressure on the closure to hold the same in the sealed position.