US PATENT SUBCLASS 220 / FOR 138
.~ Fluid-filled space between layers (fluid other than "dead" air) (220/426)

Current as of: June, 1999
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220 /   HD   RECEPTACLES

FOR 127  DF  MULTILAYER BARRIER STRUCTURE (220/415) {23}
FOR 138.~ Fluid-filled space between layers (fluid other than "dead" air) (220/426) {2}
FOR 139  DF  .~.~> Compartmented dish or tray (e.g., baby server) (220/427)
FOR 140  DF  .~.~> Water or steam (220/428)

DEFINITION

Classification: 220/FOR.138

Fluid-filled space between layers (fluid other than "dead" air):

Foreign art collections including a container wherein a space between at least two plies or laminas contains a specific liquid or gas.