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When did Elisha Grey get a patent?
When did Elisha Gray patent a harmonic telegraph?
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Did Elisha Gray develop a telegraph device?
On July 27, 1875, Gray was granted U.S. patent 166,095 for "Electric Telegraph for Transmitting Musical Tones" (acoustic telegraphy). His experiments with transmitting musical tones went further, and on February 15, 1876 Elisha Grey was granted US Patent for electro-harmonic telegraph with piano keyboard.
He studied electricity at Oberlin College. In 1867, Gray received his first patent for an improved telegraph relay. During his lifetime, Elisha Gray was granted over seventy patents for his inventions, including many important innovations in electricity.
On Feb. 14, 1876, the day that Bell filed an application for a patent for a telephone, Gray applied for a caveat announcing his intention to file a claim for a patent for the same invention within three months.
- The Editors of Encyclopaedia Britannica
In 1875, Bell filed a patent application for a primitive fax machine which included drawings of multiple liquid transmitters and the Patent Office granted his application as Patent No. 161739 in April, 1875—ten months before Gray filed his telephone caveat.
Aug 2, 2019 · On August 2, 1835, American electrical engineer Elisha Gray was born. Gray is best known for his development of a telephone prototype in 1876 and is considered by some to be the true inventor of the variable resistance telephone, despite losing out to Alexander Graham Bell for the telephone patent. But besides the telephone, Gray was a ...
Jan 22, 2016 · In 1865, he invented a self-adjusting telegraph and received a patent. This was the first of a series of more than ninety patents that Gray would receive in his lifetime. In 1869, Gray co-founded a telegraph equipment supply company, named the Gray & Co. in Cleveland, Ohio.
Oct 20, 2008 · However, as the holder of half a dozen patents, he acquired a close knowledge of the patent process which inspired him to write his latest book: The Telephone Patent Conspiracy of 1876: The...
