4.(2.0 points) What are the two parts of the patent database of the United States Patent and Trademark Office? invent

The patent database of the United States Patent and Trademark Office is divided into two parts: authorized patent database and open patent database. The official website established by USPTO (United States Patent and Trademark Office) provides free full-text and pictures of American patents to Internet users, which is divided into two parts: authorized patent database and patent application database.