I did a little quick research on Arthur Bronwell, who was mentioned in the discussion as inventor of a color picture tube.
https://en.wikipedia.org/wiki/Arthur_Bronwell
His paper is summarized in a Dec 1947 report on the National Electronics Conference in Chicago, but without diagrams or enough detail to fully understand it. He proposed having a single electron gun and three transparent screen layers of different phosphors somehow insulated from each other, plus a fourth electrode layer, all of which could have a switched potential that somehow would allow only one layer to fluoresce at a time. It was proposed to do switching at either field or line rate. This summary is repeated in Abramson's second book, History of Television 1944-2000, with no further details. It is not clear if Bronwell ever created a physical model. My guess is that it never went beyond a proposal on paper.