Following up on our discussion of trapezoidal boxes, here are three earlier patents. Unlike the Bratz brand’s unsuccessful attempt to trademark trapezoidal-shaped cardboard boxes, in general, these inventors sought to patent the manner of construction rather than the final polyhedral form.
First up: a collapsible trapezoidal hat box from 1901. (above)
(One more, after the fold…)
Next, a proposed trapezoidal milk carton from 1969.
A finally, a 1998 patent for a one.jpgece, trapezoidal folding carton with an inner partition “for packaging an article.”
Beach Packaging Design