Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B31
MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
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B31B
MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
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2110/00
Shape of rigid or semi-rigid containers
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B31B2110/30
having a polygonal cross section
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B31B2110/35
rectangular, e.g. square
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