Ralph H. Baer, who turned television sets into electronic fantasy lands by inventing and patenting the first home video game system, died on Saturday at his home in Manchester, N.H. He was 92.

His death was confirmed by his family.

Video games have become more than just a ubiquitous pastime and a gigantic market (by some estimates, total worldwide sales of console hardware and software and online, mobile and computer games exceeded $90 billion in 2013). They are also an engine that has driven scientists and engineers to multiply computer speed, memory and visualization to today’s staggering capabilities.

In March 1971, Mr. Baer and his employer, Sanders Associates in Nashua, N.H., filed for the first video game patent, which was granted in April 1973 as Patent No. 3,728,480. It made an extraordinarily large claim to a legal monopoly for any product that included a domestic television with circuits capable of producing and controlling dots on a screen.

Sanders Associates licensed its system to Magnavox, which began selling it as Odyssey in the summer of 1972 as the first home video game console