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Joseph Meshi is the inventor of the first digital chess clock.
The first commercially available digital chess clock was patented in 1975 by Joseph Meshi and Jeffrey R. Ponsor. They named it the Micromate-80.There was only one made and this was tested by chess players in multiple tournaments. Three years later a much-improved Micromate-180 was produced alongside Meshi's MBA thesis, "Demand Analysis for a New Product (The Digital Chess Clock)", at San Diego State University, while Meshi and Ponsor continued to develop digital gaming.
The Micromate-180 gave each player a fixed period of time at the start of the game and then added a small amount after each move. Joseph Meshi called this "Accumulation" as it was a main feature of his patented Micromate-180 (US Patent 4,247,925 1978).This became the linchpin of Bobby Fischer's chess clock patented ten years later. This timing method is called "accumulation" (Meshi-first to describe and name) but it is also called "increment", "bonus", or "Fischer".