Online database search is a common patent query method. Intellectual property offices in many countries and regions provide free online patent databases for public inquiry. These databases usually contain detailed patent information, such as patent name, applicant, application date, abstract and full text. Users can search by keyword, patent number or applicant's name. For example, the official website of China National Intellectual Property Administration, China provides such an online patent database for public inquiry.
Official website query of Patent Office is another reliable patent query method. Official website, the patent offices of various countries, usually provide patent inquiry service, and some also provide advanced search function, which can conduct complex search according to various conditions and improve the accuracy of inquiry. In addition, the official website of the Patent Office will release the latest patent trends and policies to provide more background information for the inquirers.
Professional patent search engine is also a good choice. Some commercial patent search engines, such as GooglePatents and PatentScope, provide more powerful search functions and richer patent data. They can not only provide detailed patent information, but also carry out patent analysis, comparison and trend research, so as to provide inquirers with deeper insights.
Generally speaking, patent inquiry needs to master certain retrieval skills and patent knowledge in order to find the required information more accurately. Different query methods have their own advantages and disadvantages, and inquirers can choose the appropriate method according to their own needs and habits. Either way, you need patience and care to find valuable content from a large number of patent information.