Can a free float trap apply for a patent?

according to article 22 of the patent law, inventions and utility models granted patent rights should be novel, creative and practical.

an application that does not meet the above conditions will not only be impossible to obtain a patent, but also cause a great waste of time, energy and financial resources for both the applicant and the patent office.

The floating-ball trap was invented by Japan in the 197s, with a history of nearly 4 years. The patent protection period of TLV is estimated to have expired, and it has long been out of the question of "novelty and creativity". Generally, the patent office will not grant it. Unless it is an appearance patent, it can be applied.