I think it did get added to the NTSC Standards - https://en.wikipedia.org/wiki/NABTS https://en.wikipedia.org/wiki/NABTS That said, there were several other co

I think it did get added to the NTSC Standards - https://en.wikipedia.org/wiki/NABTS https://en.wikipedia.org/wiki/NABTS That said, there were several other competing standards offered at the same time including https://en.wikipedia.org/wiki/Electra_(teletext) https://en.wikipedia.org/wiki/Electra_(teletext) The issue of course - like everything else with standards adoption in the states, the decoder wasn't mandated to be included with TV sets.