PTFE tape, also known as Teflon tape, was not invented by a single person. It was a result of research and development at DuPont in the 1930s and 1940s.

Here's a breakdown:

* 1938: Roy Plunkett, a chemist at DuPont, accidentally discovered PTFE (polytetrafluoroethylene) while working on a new refrigerant.

* 1940s: DuPont developed methods to manufacture PTFE on a large scale.

* 1940s-1950s: The use of PTFE expanded, leading to various applications, including non-stick cookware and electrical insulation.

* 1950s-1960s: PTFE tape was developed as a way to seal threaded pipe joints, taking advantage of PTFE's unique properties like low friction and chemical resistance.

Therefore, while Roy Plunkett played a crucial role in discovering PTFE, the development and commercialization of PTFE tape involved contributions from numerous scientists and engineers at DuPont.