I have found the SDMB Holy Grail!
The patent date says 1953, but mebbe that just when he decided to patent it. He may have invented it in the 1950s and then tried to keep it secret.
Doesn’t say where you can buy one. The gummit is probably hanging on to all of them in case Saddam rises from the dead or Dubya’s Lyme disease flares up again.