Curious to ask ~ ~ ~ patent questions

There are three kinds of patents, one is invention, which requires the highest creativity; The utility model needs some creativity; Design needs to design the appearance of the object. If you apply for a patent for underwear, it is usually a design, and the validity period of the design is 10 year. So the possible situation is 1. The patent applied for this underwear has expired, that is to say, after 10 years, it may be applied by other companies or companies of these two brands, but as long as it is 10 years, these design patents will be invalid, which is equivalent to publicity, and everyone can use them. One of them has applied for the design of this underwear, and the other one is equivalent to infringing the patent right of this company and can claim compensation from the other company. Neither company has applied for a design patent, so you can use it at will.