General Motors owns a patent on leaded gasoline.
https://www.history.com/this-day-in-history/gm-engineers-dis...
https://www.history.com/this-day-in-history/gm-engineers-dis...
1: https://en.wikipedia.org/wiki/Thomas_Midgley_Jr.#Later_life_...
> Midgley participated in a press conference to demonstrate the apparent safety of TEL, in which he poured TEL over his hands, placed a bottle of the chemical under his nose, and inhaled its vapor for 60 seconds, declaring that he could do this every day without succumbing to any problems.