Hello vintage drum enthusiasts! Not sure if anyone has covered the history of the roto tom, but here is a new page on the Roto Tom web site.
I was fortunate to be able to talk to Al Payson a few days ago and get some more details about the history. He was the inventor of the roto tom.
The principle of turning a drum to tune it has been around since the early 1900's. It was later used by Ludwig for bongos and congas.
Payson was asked to create a drum....... Read the article :)
AND there is no patent for the Roto Tom. Remo or Payson never got one. Probably because the concept had been used in drum making already.
David