[old_tv_nut]

Zenith also developed technology licensed for other purposes. I believe they developed some of the first wideband oscilloscope tubes and licensed that to Tektronix. Later they did a lot of the early work on plasma displays. They also designed, made, and used surface wave IF filters in the later years of analog TV. I personally worked on analog IC design for color TV. They had tentative plans to do final fab on pre-implanted wafers, but that was scotched when the estimated $300M capital expense was not supported by decreasing profits in the 70s. However, they continued to use their proprietary designs, made by a third party vendor.