US PATENT SUBCLASS 229 / 122.21
.~ Box includes two side walls which are not formed from the same piece of box material


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229 /   HD   ENVELOPES, WRAPPERS, AND PAPERBOARD BOXES

100  DF  PAPERBOARD BOX {54}
122.21.~ Box includes two side walls which are not formed from the same piece of box material {3}
122.22  DD  .~.~> One of the walls is made of wood, metal, or rigid thermoplastic material
122.23  DD  .~.~> Each of two pieces of box material folded into a "U" shape to form a pair of opposed box walls connected by an intermediate wall panel (e.g., "crossed blanks")
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}