Development and utilization of invalid patents

1 Obtaining Invalid Patents by CD-ROM. The China Invalid Patent CD-ROM Database, which was officially published by Patent Literature Publishing House, stores about 250,000 invalid patent information. It is an important database for retrieving invalid patent information of 1985-04 1 related disciplines, and has the advantages of multiple retrieval channels, strong functions and high speed. The search results also show the reason and date of patent invalidation. Obtaining invalid patents through the Internet, searching China National Intellectual Property Administration through the computer network, entering the website, and clicking on the China patent literature database, invalid patent literature will appear for people to choose to use. Obtaining invalid patents from conventional channels Obtaining invalid patents from China patent index, patent bulletin, patent specification and other printed patent documents. Among them, the first two are retrieval tools, and the latter patent specification is a document, reflecting the full text of invalid patents. 4 Establishment of invalid patent characteristic database University libraries can establish several unique invalid patent characteristic databases according to the needs of key topics and disciplines of the school, and provide services online to realize the * * * enjoyment of invalid patent literature resources. The acquisition of invalid patents abroad is generally searched by wpi and wpa from two ways: subject and classification. It can also be searched through the patent index of ca. You can also search the foreign patent databases including the full texts of American patents, ep patents and wo patents through the Internet, and verify the obtained information through the China patent database to confirm whether these foreign patents have applied for China patents and whether they have expired, so as to obtain a number of relevant foreign invalid patents.