3891792 is referenced by 305 patents and cites 7 patents.

A method and apparatus for superimposing printed characters of any such nature as may be transmitted upon a received television image, at the will of the viewer at the receiver. The character information is incrementally transmitted during the vertical blanking interval of the television scanning format. The receiver is especially constructed to have a dynamic shift register, also means to manually select one or none of plural character programs; such as news, stock market, or weather. The characters may be made to crawl horizontally to present an extended message, which crawl may be halted by the viewer. The mandatory display of emergency messages is possible by a control located at the transmitter.

Television character crawl display method and apparatus
Application Number
Publication Number
Application Date
June 25, 1974
Publication Date
June 24, 1975
Kimura Hisao
Lubcke Harry R
Asahi Broadcasting Corporation
G08b 05/36
H04N 07/87
H04N 07/88
G09G 05/34
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