Bell applied for a telephone patent in the US Patent Office on February 1876 and 14. Two hours after his application, a man named e. gray also came to the patent office to apply for a telephone patent. Gray's principle is to use the resistance change of the liquid inside the microphone, and the receiver is exactly the same as Bell's. The following year, namely 1877, Edison obtained the invention patent of carbon particle microphone. Among them, the patent dispute is complicated, and it didn't come to an end until 1892. One of the reasons for this situation was that the largest Western Union telegraph company in the United States bought the patents of Gray and Edison at that time and confronted Bell's telephone company.
Due to the long-term patent dispute, the two sides reached an agreement. Western Union Telegraph Company fully recognized Bell's patent right and never set foot in the telephone industry again. In exchange, it shared 20% of Bell's income in 17.
On June 16, 2002, the U.S. House of Representatives voted to overturn the history of Bell's invention of the telephone and admitted that meucci was the first person to invent the telephone.
After the U.S. House of Representatives made a resolution, the Canadian House of Representatives quickly made a resolution reaffirming that Bell was the inventor of the telephone, in order to counter the U.S. House of Representatives. The dispute over the right to telephone invention seems to be difficult to calm down for a while.