If you buy a trademark, you will enjoy the legitimate rights and interests of the trademark. You may or may not use the trademark in the future, but if you don't use the trademark for three consecutive years, anyone has the right to revoke the rights and interests of the trademark.

Just because the trademark is bought does not mean that the patent right is also sold to you. If it's an appearance patent and the other party's trademark is sold to you, you can't use your registered trademark on the other party's goods without authorization.

The third question was ignored. joke