Stock material or miscellaneous articles – Collapsible article
Patent
1987-04-21
1988-12-20
Epstein, Henry F.
Stock material or miscellaneous articles
Collapsible article
108161, 4285428, A47B 1300
Patent
active
047924705
ABSTRACT:
In a twisted, free-standing structure having four sides, each with a diagonal crease, and a central region wherein the creases cross, the improvement wherein the central region is reinforced by means chosen from the group consisting of a thermosetting polymeric material and one or more pieces of stiff reinforcing material bent to conform to a crease.
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