description Erna Schneider Hoover Overview
Erna Schneider Hoover is an American mathematician and computer scientist recognized for her work in telecommunications engineering at Bell Laboratories. She is known for inventing a computerized switching system for telephone traffic, for which she received one of the first software patents in 1971. Her stored-program control method utilized a feedback mechanism to prioritize tasks, preventing system overloads during peak call volumes. This innovation improved the reliability of modern telephone networks.
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What did Erna Schneider Hoover invent?
At Bell Labs, she designed a computerized switching method that monitored incoming call traffic and adjusted acceptance rates during overloads. It helped protect electronic telephone exchanges from collapsing during peak demand. [National Inventors Hall of Fame](https://www.invent.org/blog/inventors/erna-schneider-hoover)
What patent is associated with Erna Schneider Hoover's telephone system?
Her feedback-control system was patented as US Patent 3,623,007, issued on November 23, 1971. It is often described as one of the first software patents. [Lemelson Center](https://lemelson.mit.edu/resources/erna-hoover)
How did Hoover's system improve telephone service?
The software gave priority to call-processing work over lower-priority tasks such as billing and record keeping. Bell Labs put the first stored-program-control system into private service in 1963 and public networks by 1965. [National Inventors Hall of Fame](https://www.invent.org/blog/inventors/erna-schneider-hoover)
What else did Erna Schneider Hoover do at Bell Labs?
Hoover worked on the Number 1 ESS, writing specifications for the computer and its operating system, and later led technical departments. She retired in 1987 after 32 years at Bell Labs. [National Inventors Hall of Fame](https://www.invent.org/blog/inventors/erna-schneider-hoover)
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