On this day, 44 years ago, on November 2, 1981 (October 6, 1981, the China Patent Documentation Library was officially opened. On November 2, 1981, the China Patent Documentation Library was officially opened. A patent document is a technical specification that specifically records new inventions. In countries and regions that implement the patent system, patent documents have developed into an important tool for rapidly popularizing and disseminating information on new inventions. It can enable people to promptly understand what new technologies and inventions exist in the world, whether it is scientific research, production, management, and foreign trade units, can benefit from consulting patent documents. At present, the Library collects patent specifications from 15 countries and two international organizations, patent bulletins from more than 20 countries, and patent reference books. There are nearly 8 million pieces of patent documents available for readers to consult. The library has a reproduction group that accepts reproduction work entrusted by readers, and other places can also send letters to handle reproduction work.