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Invalid patent (including invalid patent application) technology has lost the protection of patent law and become the wealth that the public can use for free. It is the product of people's technological innovation and the crystallization of the hard work of scientific and technological workers all over the world. Although invalid patent (including invalid patent application) technology has lost the protection of patent law, its gold content is beyond doubt. Therefore, there is a saying in the patent field: "Invalid patent (including invalid patent application) technology is a golden mountain waiting for people to develop." The function of this software is to search China patent database in various ways and find out all the patents that meet the requirements. You can choose practical patents for free according to your own reality, so that you can produce products according to patent drawings.