What is the patent number of the cow fart collector?

CN200410016097.3.

The patent number of the cow fart collector is CN200410016097.3. The cow fart collector connects a tube to the cow's stomach to collect the gas produced during the cow's digestive process. Cow fart collectors can save energy, reduce emissions, reduce air pollution, and can also generate electricity. The farts collected by a small farm in one day can run an ordinary refrigerator for 24 hours.