Can an invalid patent be reapplied?

Invalid patented products are no longer protected. Since the invalid patent has been patented and made public, the re-submitted patent application is not novel. However, an invention-creation that is improved on the basis of the original patent may be granted a patent right after applying for a patent.

First, if you want to have a patent certificate, then you can apply for a patent for utility model. If your method has been patented for so long, you say it is different from the original method. According to the actual situation, I think you can still apply for a patent. The method that doesn't work is a patent in itself, and it doesn't necessarily lead to different results before applying for a patent. The mobile phones used by everyone are not from the same company. Every company that produces mobile phones has its own patent. It can be said that now that you have a mobile phone, you can't apply for a mobile phone. In addition, the utility model and appearance patent department has undergone substantive examination, so if you want to have a patent certificate, you can still apply! If you want to attack others, don't say that you have achieved the result. Even if you haven't done it or copied it from others, there may not be such a method in the world.