Can I apply for a patent for something that has been widely used?

ok. The same thing can still be many different.

1. In terms of appearance, if there is something original, you can apply for a patent for appearance.

2. in terms of use, if there are any special functions that the same product does not have, you can apply for a patent for utility model.

3. If the application software is involved, you are involved in programming alone, you can apply for software copyright.

in a word, you can apply for a patent for one thing that makes your product different.

If the landlord thinks that the angles I mentioned are inspiring to you, please adopt them. thank you