US PATENT SUBCLASS 220 / FOR 137
.~.~ Layer-space-layer only (220/425)


Current as of: June, 1999
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220 /   HD   RECEPTACLES

FOR 127  DF  MULTILAYER BARRIER STRUCTURE (220/415) {23}
FOR 132  DF  .~ Evacuated space between layers (220/420) {3}
FOR 137.~.~ Layer-space-layer only (220/425)


DEFINITION

Classification: 220/FOR.137

Layer-space-layer only:

Foreign art collections including a container having at least two spaced plies with nothing between them other than a gas at a pressure lower than atmospheric pressure.