Lloyd Espenschied

Lloyd Espenschied (born April 27, 1889 in St. Louis , † June 1, 1986 ) was an American electrical engineer.

Espenschied grew up in Brooklyn from 1901 with relatives of his mother. After graduating from the Pratt Institute in 1909 , he first worked for the Telefunken Wireless Telegraph Company , for which he installed radio systems in ships of the US Navy. In 1910 he moved to the development department of AT&T (later Bell), where he worked on coiled cables . Around 1915 he experimented with tubes and long-distance radio telephone . The following year he tested a radio link between Arlington , Virginia and Pearl Harbor , Hawaii .

1916-18 he worked with several colleagues, such as Herman A. Affel, on a carrier frequency system between Baltimore and Pittsburgh.

In 1927 he acquired a patent for quartz filters as bandpass filters.

Together with Affel, he registered a patent for a Concentric Conducting System ( coaxial cable with frequency multiplex) on May 23, 1929 , which was granted on December 8, 1931.

In 1924 he was patented a collision detection for railroad trains. He used a similar technique for the radio altimeters that the Western Electric Company produced from 1937.

Espenschied held a total of more than 130 patents. Because of his many services to telecommunications technology, he was awarded a Medal of Honor in 1940 by the Institute of Radio Engineers , a predecessor organization of today's IEEE .

The company AT & T announced in January 2008 that it had been awarded the Technology & Engineering Emmy Award in 2008 by the National Academy of Television Arts & Sciences for the invention of high-frequency broadband cable by Lloyd Espenschied in 1929 .

Web links

• Short biography at the IEEE (English)
• Interview with Lloyd Espenschied from June 2, 1973 on ieee.org (English, PDF)
• Wiki entry at the IEEE with picture
• Written estate of Lloyd Espenschied at the Smithsonian Institution in Washington

Individual evidence

1. ↑ Entry on the patenting of the broadband coaxial cable at AT & T on corp.att.com (English)
2. ↑ U.S. Patent No. 1,835,031 dated December 8, 1931 for coaxial cable
3. ↑ Short biography at www.invent.org ( Memento of the original dated February 7, 2009 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (English) 
4. ^ Message from AT & T about the award ceremony at www.reuters.com (English)