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Materials and Services Available at PTDLs
General DescriptionTo be designated as a Patent and Trademark Depository Library (PTDL), a library must meet specific requirements and agree to fulfill certain obligations as outlined in the brochure Notes on Becoming a Patent and Trademark Depository Library. Each PTDL is required to acquire and make freely available to the public a minimum 20-year backfile of U.S. patents. It must protect the integrity of the collection, maintain classification system documents and related publications, and assist the public in efficient use of the collection, and retain all depository items until disposal is arranged through the Patent and Trademark Depository Library Program (PTDLP). The intellectual property collections of some libraries significantly exceed the core requirements. All libraries have access to U.S. patents since 1790. To visit your nearest PTDL, consult the List of Patent and Trademark Depository Libraries. Printed and Electronic MaterialsAll PTDLs maintain a core collection, which includes at least a 20-year backfile of U.S. patents. Other materials available include:
Electronic DatabasesPatent and trademark electronic search products are provided to all PTDLs by the USPTO. PTDLs also provide access to the Web-based Search Tool (PubWEST) as provided in the Public Search Facility (PSF) in Alexandria, Virginia.
PTDLP Printed and Electronic Materials
Miscellaneous Publications and Helpful Documents
Disclaimer: PTDLs are neither required nor encouraged to conduct patent and trademark searches for their patrons as that activity may be interpreted as rendering a judgment or opinion. PTDLs are required to instruct patrons in the use of the search tools available at the PTDLs for patrons conducting their own patent and trademark searches. (Plug-in needed to view PDF files on this page) |
Is there a question about what the USPTO can or cannot do that you cannot find an answer for? Send questions about USPTO programs and services to the USPTO Contact Center(UCC). You can suggest USPTO webpages or material you would like featured on this section by Email to the webmaster@uspto.gov. While we cannot promise to accommodate all requests, your suggestions will be considered and may lead to other improvements on the website.
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