Don’t Convert to R134a

MV8 said
If memory serves, Dupont owned R12. They knew the patent was running out

"Factless conspiracy theories that refuse to die for a thousand, Alex!"

US patents last 20 years. The patent on R12 would have expired in 1948.

So yeah, your memory was serving you there, but what it was serving you was less like new oats and more like used ones.