1. China National Intellectual Property Administration patent service system: official website, China National Intellectual Property Administration provides a patent service system, which can query the patent status and patent literature of domestic patents, and support online application and payment of patent fees.
2. European Patent Affairs Service System: The European Patent Affairs Service System (EPOline) is an online service platform provided by the European Patent Office, which mainly provides online services for European patent applications, including application, payment of fees, patent status inquiry, etc.
3. American Patent Affairs Service System: The American Patent Affairs Service System (Public PAIR) is an online service platform provided by the US Patent and Trademark Office, providing a large number of patent information inquiry and online application related services.
All the above three systems have high coverage and utilization rate, which can not only query the existing patent information, but also carry out patent application and related payment operations, and provide flexible online operation interface for users to query and operate. It should be noted that the corresponding service platforms and functions should be selected according to the actual needs in operations such as inquiring patent status or applying for patents.