1876 February 14, Bell applied for the telephone patent right in the US Patent Office; 10 In March, Bell obtained a patent for telephone invention, announcing the arrival of a new era of mankind.
Bell, 29, invented the telephone. Two years later, on 1878, Bell established a telephone company, and realized the long-distance telephone test between Boston and new york, which are 300 kilometers apart. Since then, the telephone has spread rapidly in major cities in North America, and quickly swept the world.
Bell has made outstanding contributions in the fields of acoustics and electricity, and obtained more than 30 patents, half of which are telephones. His name "Zhong" was later used as a unit for measuring sound intensity level in acoustics, and it was also used in electricity to calculate the ratio of current or voltage and the ratio of output to input power.
Other inventors Gray and mutch.
However, Bell was not the only one who invented the telephone. A man named Gray once filed a lawsuit with Bell over the telephone patent right. They filed the patent on the same day, but Graybeal Bell was about two hours late and finally lost the case.
It is worth mentioning that Antonio mutch, the "inventor of the telephone" who changed his name in the 2nd/Kloc-0th century, fought a marathon lawsuit with Bell for the right to invent the telephone.
Mutch/Kloc-0 was born in Florence in April, 808, and/Kloc-0 moved to the United States in August, 845. In order to improve his living environment, he began to study electrophysiology, and he was very interested in it. Soon, he invented the method of treating diseases by electric shock. But on 1849, when he prepared a set of equipment to treat his friends in another room, an unexpected miracle appeared. He clearly heard his friend's voice coming from the other room through the wire connecting the two rooms. At that time, he inserted a metal reed connected with a coil into a friend's mouth, and the coil was connected to a conductor in another room. In fact, the metal reed plays the role of a sensor here. It is because it is connected with the coil that its vibration is converted into current. Mutch immediately realized the unusual significance of this phenomenon, and immediately began to study what he called the "talking telegraph" device. At that time, his future competitor Bell was only 2 years old.
In 1854, mutch made the first prototype that worked like a telephone. He once described it like this: "This is a vibrating diaphragm, which changes the current on the electromagnet. This change in current, when it reaches the other end of the wire, will transfer the same vibration to the receiving diaphragm, and it will be restored to text. "
The following year, mutch's telephone was named "long-distance telephone". At the same time, the equipment is still being further improved: at first, the rough coil has been replaced by the combination of magnetic coil and diaphragm. In addition, mutch also envisages strengthening the signal multiplier along the route to avoid the gradual attenuation of long-distance transmission signals.
1860, mutch published an introduction about the telephone prototype in an Italian newspaper in new york, but he didn't apply for a patent for invention, because it cost 250 dollars to apply for a patent in the United States at that time, and mutch was poor and didn't know English, so he couldn't integrate into American society. 1870, Qi Mu, who was over 60 years old, was seriously ill. In order to treat the disease, he had to sell his hard-made telephone equipment for 6 dollars. From 65438 to 0873, mutch lived in poverty and had to live on social welfare. 1874, mutch sent his telephone equipment to Western Union for sale, but the equipment was lost by Western Union. Later, Bell signed a contract with Western Union, and mutch went to court for a lawsuit, which dragged on for a long time because of insufficient evidence. 1889, just as there was a rumor that Mucci was going to win the right of telephone invention, poor him died. It was not until 1 13 that Mu Qi was approved by the US Congress for his invention right.