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I think CBS and their Hytron tube division did develop the method of using the shadow mask to deposit dots on the faceplate of the CRT. They were producing the 15HP22 dots-on-face CRT in the fall of 1953. How DuMont fits into this picture is fuzzy. Maybe DuMont developed a parallel technology, maybe they were working under license from CBS-Hytron. Why did DuMont not bring the tube to market? Did they run into patent conflicts with CBS-Hytron or RCA? Or maybe they just realized the development costs were not justified?
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John Folsom
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