[1][5][6] He was next employed by Ramo-Woolridge Corporation in 1954; Ramo-Woolridge joined with Thompson Automotive Group in 1958, and eventually in 1965 Thompson-Ramo-Woolridge became known as TRW Inc.[1][2][7][8] Buie invented transistor-to-transistor logic circuitry ("TTL") in 1961 at TRW which played a major role in the development of the integrated circuit industry.

[2][9][10] TTL integrated circuits use transistors for the input gating structure instead of diodes, resistors, and capacitors as was used in the previous technology.

Buie's integrated circuit chips in the 1970s were the preferred technology for mini-computers, computer peripherals, factory controls, and test instrumentation.

He then began part-time work as a consultant for the Large Scale Integration division of the company (TRW/LSI Products).

In March 1988 he no longer could physically make the trip to his offices there, and then just did some work on his personal computer at home communicating with TRW by phone.

Buie continued to fail in health and died in Panorama City on September 23, 1988, aged 68.