US PATENT SUBCLASS 229 / 122.25
.~.~.~ The third and fourth walls framed by lengths of rigid material (e.g., wood, metal, rigid thermoplastic)


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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

100  DF  PAPERBOARD BOX {54}
122.21  DD  .~ Box includes two side walls which are not formed from the same piece of box material {3}
122.24  DD  .~.~ First and second opposed side walls and the bottom wall formed from a single piece of material, and third and fourth opposed side walls formed from two other pieces of material (e.g., "Bliss box" type) {2}
122.25.~.~.~ The third and fourth walls framed by lengths of rigid material (e.g., wood, metal, rigid thermoplastic)