04647217 is referenced by 172 patents and cites 7 patents.

A timepiece with variable color digital display indicates time in digital format and in a color variable in accordance with the output of a transducer. In the preferred embodiment, the color of the timepiece display is controlled, either in a plurality of steps or substantially continuously, in accordance with the functioning of a heart beating within the body of a timepiece user.

Title
Variable color digital timepiece
Application Number
6/817114
Publication Number
4647217
Application Date
January 8, 1986
Publication Date
March 3, 1987
Inventor
Karel Havel
15 Kensington Rd., Apt. #704, Bramalea, Ontario
CA
IPC
A61B 5/02
G04B 47/00
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