When was canned beer invented? It was invented in 2006. How is that possible? Can your Excellency give an answer? thank you

The canned beer was patented by a man named Sun Jie on June 22nd, 2006. Characterized in that a liquid nitrogen container is additionally arranged in the beer in the tank, the container is filled with liquid nitrogen, and the container is provided with a nitrogen gas inlet and a nitrogen gas outlet. When filling beer, put in a liquid nitrogen ball. At this time, part of liquid nitrogen is converted into nitrogen due to contact with air, and the air at the top of the tank is exhausted to prevent beer from oxidation. When the lid of the can is opened, air enters, liquid nitrogen is gasified and released from the air outlet, and a large number of bubbles rise, forming a fine white foam accumulation at the cup mouth, and the foam hangs on the glass for a long time, which has a good taste.