As an aside, this is the third time I’ve tweaked this art. Not counting my first raster attempt in 2000. Barring the invention of an actual time machine and a trip back to the set in 1989, or the discovery of some long-lost photos, I think this is as close as we’ll get.
There were multiple different kinds of pink hoverboards made for the film, and they vary in materials and workmanship. Here, we can see that the handlebar hole has at least two variations, and may even be missing altogether on some boards.
These appear to have been filed by Nike in 1990, and granted in 1992. I don’t know if they are still valid. They have an initial term of 14 years. They may have expired, they may have been renewed, or they may have been superseded by new design patents, or protected by changes in patent law. Design patents only protect the ‘look’ of an item, they have nothing to do with functions, use or technology. These do not related to the ‘functional’ mechanisms of the shoes (lights, laces). Note also that they do not cover all aspects of the shoe: just the upper, the back of the strap and the heel.
USA Today posted this still taken (presumably) just after the hoverboard chase:
Now, I’m no expert, but what is the thing Terry’s holding in his hand? It’s not his “thumb a hundred bucks” thing; this prop looks enormous (relatively), and I have no idea what it is. It doesn’t look like a parking meter. It’s not Griff’s bat, or the little girl’s hoverboard handlebars … Any guesses?
Early storyboards showed this as a Swatch-branded hoverboard. Other concept art showed amn Airwalk hoverboard, and surfboard-sized hoverboards (which can be seen briefly being carried by an extra early in the film).
In this frame (above) you can clearly see the (green) Velcro used to hold the lightweight foam boards to the actors’ shoes when hanging from the wire rigging to film the ‘hovering’ shots.
This still proves the existence of the rare and elusive orange Mattel hoverboard (undr the other child’s foot):