tektronix plasma switches

[coppercone2]

I was reading about plasmatrons on wikipedia and I  ran into this

ALC was originally developed by Thomas Buzak, who worked at Tektronix in the U.S. Through the late 1980s and early 1990s he developed and patented a number of concepts that used plasma to provide a switching element for a variety of uses

I looked at his patents and almost everything was specific to the display technology.

Does anyone know what the more general patent relating to 'variety of uses' might be?

[ahsrabrifat]

 Buzak’s work was associated with Tektronix.You can search patents assigned to Tektronix in the 1980s and 1990s with "plasma" and "switching".