information:extraction, linguistic:paraphrasing
Fischer clock

In 1988, Fischer filed for U.S. patent 4,884,255 for a new type of chess clock, which gave each player a fixed period at the start of the game and then added a small increment after each completed move.

An example of Fischer's patented clock was made for, and used in, the 1992 rematch between Fischer and Spassky. Clocks based on the "Fischer clock" soon became standard in major chess tournaments. Fischer would later complain that he was cheated out of the royalties for this invention.