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Patent and
Trademark Depository Library Program (PTDLP)
See the PTDLP
Library Directory for a state-by-state listing of PTDL Libraries.
- The U.S. Patent and Trademark Office (USPTO) has specially designated
over 80 libraries throughout the U.S. as Patent and Trademark Depository
Libraries (PTDL).
- PTDL Libraries are open to the public and provide specialized services
for people seeking patent and trademark information. If you have a PTDL
Library close to you, a visit to it may save you hours of searching.
- PTDL Libraries receive and make available to users: -Utility,
Design, Plant and Reissue Patents
- Reexamination Certificates
- Statutory Invention Registrations (SIRs)
-Post-issue patent status information
-The Official Gazette of the U.S. Patent and Trademark Office
(both patent and trademark sections)
-All PTO search tools, indices and directories
- PTDL Libraries are required to have at least 20 years of U.S. Patents
available for the public; many PTDL Libraries have much more extensive
collections of patents. They also can provide assistance in accessing and using web based products available from the USPTO.
For more information about the PTDLP Program and Librarias:
Description of the PTDLP program from the USPTO web site: Patent and Trademark Depository Library Program
Tutorial: How to Conduct a Preliminary U.S. Patent Search: A Step-by-Step Strategy.
Directory of PTDLP Libraries PTDLP
Library Directory for a state-by-state listing of PTDLP Libraries.
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