In the patent list retrieved from the patent database, which fields of patents cannot be displayed?

The patent list retrieved for the patent database cannot show the patent field, such as copyright, database, system or network.

1. Copyright: Some patents are protected by the applicant or the patentee, and the detailed information in the patent list may not be available.

2. Database, system or network: Due to network problems or database system failures, some fields cannot be read normally and cannot be displayed in the patent list.

The list of patents retrieved from Dawei patent database should be able to display the relevant information of most patents, including patent number, patent name, applicant, inventor, abstract, patent classification number, application date, publication date, patent type, etc.