科技工作者的好帮手──《中国专利数据库》据最新的权威统计资料，在世界３０００余万份专利文献中，北京的中国专利文献馆占有２５００万份。除节假日外，该馆所藏的专利文献以开架、免费方式向公众开放服务；全国还在省级以上中心城市设有６Ｏ多个专利文献服务网点，为... According to the latest authoritative statistics, among the more than 30 million patent documents in the world, the Chinese Patent Library in Beijing occupies 25 million copies. In addition to holidays, the museum’s possession of patent documents to the open, free way to open the service to the public; the country is still above the provincial level cities with more than 6O patent documentation service outlets, as ...