US PATENT SUBCLASS 220 / FOR 137
.~.~ Layer-space-layer only (220/425)
Current as of:
June, 1999
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220 /
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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.