More than 30 national patents and PCT patents (international patents), as well as Japanese patent abstracts.
Electronic resource query:
"derwent Patent Index" in "Knowledge Network" database. It contains patent information of more than 40 patent institutions around the world. Most American patents, European patents and Japanese patents can be obtained directly and updated weekly. Derwent is a British publishing company (derwent Publishing Co., Ltd.) specializing in patent information. It collected and reported the patent documents of dozens of countries and international organizations in the world, entitled
Patent database in Wanfang data resource system. For a summary of patents accepted in China since 1985, please see the full text.