The term kinescope originally referred to the cathode ray tube used in television receivers, as named by inventor Vladimir K. Zworykin in 1929.[1] Hence, the recordings were known in full as kinescope films or kinescope recordings.[2][3][4] RCA was granted a trademark for the term (for its cathode ray tube) in 1932; it voluntarily released the term to the public domain in 1950.[5]