Can inventions without patent certificates be produced and used in the market?

The core of the patent system is to exchange publicity for protection, so the utility model cannot be restricted to others before the authorization announcement. But as long as the other party agrees, you can charge some technical use fees, no problem.

For inventions, you can sell and use them in the market at any time. But before the publication, like the utility model, it cannot be restricted to others. After publicity, it is in a temporary protection state before authorization, that is, if someone uses it, you can ask him to pay the usage fee, but he can give it to you or not. If it is given to you, it will become your money, and he will not go back to the court; If you don't give it to you, you won't go back to the court at this time, and the court won't support you until it is authorized.