Who made first microwave?

The first microwave oven was invented by Percy Spencer in 1945. Spencer was an American self-taught engineer and inventor who worked for the Raytheon Corporation. While experimenting with a magnetron, a high-powered vacuum tube used in radar systems, Spencer noticed that a candy bar in his pocket melted. He realized that the microwaves emitted by the magnetron were causing the candy to heat up. Spencer went on to develop the first microwave oven, which he patented in 1945. The first commercial microwave oven was introduced in 1947.