U.S. authorized patent retrieval: users can retrieve all kinds of U.S. authorized patent documents since 1976 from 31 retrieval portals, including full-text retrieval of coded full-text patent specifications; The system can also be used by the public to retrieve various American authorized patents since 179 from two kinds of number retrieval portals, and browse various scanned image American authorized patent specifications. The scope of collection: including all authorized patent documents published by the US Patent and Trademark Office from 179 to the latest week. The types of patent documents included in this retrieval system include: utility, namely Patent Grant, Design patent, Plant patent, patent for re-announcement, Defensive announcement and legally registered invention (abbreviated as SIR). Among them, the data from 179 to 1975 are only full-image, and the searchable data are only patent number and American patent classification number; The data after January 1, 1976 include not only the image-based full text, but also the searchable basic description items, abstracts and full-text data of authorized patents (including specifications and claims). Retrieval of American patent application publication: Users can search the published documents of American patent application since March 15th, 21 from 23 kinds of retrieval portals, and at the same time provide coded and scanned image full-text American patent application publication instructions for the public to search and browse the full-text American patent application publication. The collection scope includes: the basic description items, abstracts and coded full-text data of Published PatentApplications in the United States since March 15th, 21, as well as all image-based specifications of published patent applications in the United States.