1. How to use the patent retrieval system of China National Intellectual Property Administration government website to retrieve China patents with the technical theme of "transformer cooling"? (15)
A: Select "advanced search" in the patent search column of China National Intellectual Property Administration website, and then enter "transformer cooling" or other keywords in the "abstract" entrance. Click "Search". The system will list the relevant results, and then click Open to view them one by one. You can also enter other limited keywords to make the option results more accurate and avoid too many search results. For example, if you enter "transformer cooling" in "abstract" and choose "invention patent" and "utility model" as patent types, you can retrieve the invention and utility model patents related to "transformer cooling". If you enter "Shanghai" in "Address", you can retrieve the patent of transformer cooling invention and utility model whose inventor is Shanghai.