He was born in Madrid, Spain on August 14, 1890. He received his degree in engineering and a Ph.D. in medicine. In 1911 he emigrated to the United States. He moved to Cleveland, Ohio where he married and had three children. He became the president of the Sterling Electrical Company. He became a naturalized US citizen on December 29, 1919. He claimed in 1936 that patents for his process for welding ferrous and nonferrous metals by his "invisible ray" were sold for $6,000,000. He died on, New Year's Eve, December 31, 1970 in Winter Park, Florida.
- "Inventor Hides Secret of Death Ray". Popular Science. February 1, 1940. Retrieved 2008-12-11.
- "Gadgeteers Gather". Time magazine. January 21, 1935. Retrieved 2008-12-11. "Albert G. Burns of Oakland, Calif, was re-elected president of the Congress. It was Mr. Burns who last year revealed that a Clevelander named Antonio Longoria had invented a death-ray which killed rabbits, dogs & cats instantly. President Burns said that Inventor Longoria would withhold his secret until invasion threatened the U. S."
- "Too Specific". Time magazine. October 23, 1939. Retrieved 2009-11-12. "He is also a persistent and well-publicized ballyhooer of the 'death ray' machine he claims to have invented. Says he, this machine can kill cats and dogs, bring down pigeons on the wing, at ranges up to four miles."
- World War I draft registration
- "Welder at Work". Time magazine. August 10, 1936. Retrieved 2009-11-12. "Born in Madrid 46 years ago, Antonio Longoria attended Spanish schools, got a degree in engineering and a doctorate in medicine. In 1911 he arrived in the U. S., fonder of tinkering with machines than with people. Settling in Cleveland, he married, fathered three children, became president of Sterling Electrical Co."
- U.S. Naturalization Records Indexes, 1794-1995
- "Dr. Longoria, Inventor, Says Here U.S. Steel Was a Buyer of Invisible Ray Process.". New York Times. July 29, 1936. Retrieved 2009-11-12. "Patents for his newly invented process of welding ferrous and nonferrous metals by means of an invisible ray have yielded Dr. Antonio Longoria of Cleveland about $6,000,000, the inventor declared yesterday when he arrived in New York City."
- Social Security Death Index
- Florida Death Index, 1877-1998