I was reading something a while back about the merchandising of the Star Wars license, and I seem to remember reading that there was a patent on the “cylindrical, dome-headed, 2 side legs and 1 middle leg on wheels” style of robot. It was used to point out that there was only one legal “R2-D2-shaped” item out there, made by Coca-Cola.
Is there such a copyright or patent? Is it even possible to hold a copyright on “all things that resemble this object”?
It couldn’t be a patent or copyright, since what you’re describing isn’t a technology or process, nor is it an artistic work. It would have to be a registered trademark. Lucasfilm (and Lucasfilm Games) has seven trademark registrations that you might want to dig into.
When I first saw Star Wars, I thought R2D2 was very similar to the robots from Silent Running. Now that I look at the picture, though, they aren’t as similar as I remember.