This "invention" (see paulgb's link to the patent) sounds far too much like stackable plastic milk crates with $Logo_Of_Dairy printed on the side of 'em.

Or even more like the stackable plastic trays (and carts designed specifically for them) that you could find in the dishroom of most large cafeterias 50+ years ago.

And running actual stacks of those trays through the big dishwashing machine (say, to heat up a bunch of clean soup bowls right before they hit the serving line) was "d'oh, obvious" when I briefly had a dishroom job in the early 1980's.