Mr. Joel received more than 70 patents, but was probably best known for the patent number 3,663,762, which was issued in 1972 and allowed mobile network users to make continuous calls when moving from one cell to another.
')
“Without this invention, there would not be all these people scurrying around while simultaneously talking on a mobile phone,” says Frank Vigilante, who was one of Joel’s bosses at Bell Labs. "He allowed this business to form and become a real business."
Source: https://habr.com/ru/post/43573/