This paper describes the network of Patent and Trademark Depository Libraries (PTDLs), a collaborative partnership with the United States Patent and Trademark Office (USPTO) for disseminating patent and trademark information in every state plus the District of Columbia and Puerto Rico. Typical information sources and services provided at PTDLs are given, followed by suggestions of areas on which to focus in the future for PTDLs to continue to be vital links of information that spur economic growth, business competitiveness, and the continued discovery of new scientific and technological knowledge and applications. (Contains 2 tables.)