US PATENT SUBCLASS 215 / 300
.~.~.~.~ Cavity extends circumferentially of stopper surface

Current as of: June, 1999
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215 /   HD   BOTTLES AND JARS

200  DF  CLOSURES {32}
295  DF  .~ With means to facilitate closure removal {5}
296  DF  .~.~ Stopper-type closure {3}
299  DF  .~.~.~ Permanently secured in stopper cavity {1}
300.~.~.~.~ Cavity extends circumferentially of stopper surface

DEFINITION

Classification: 215/300

(under subclass 299) Devices, wherein said cavity is formed in the wall of the closure which faces the inner surface of the mouth of the receptacle.