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Michigan State University

Patents and Patent Information at the MSU Libraries: Michigan Patent & Trademark Depository Libraries

Guide to US and international patent resources.

Michigan PTDLs

"A Patent and Trademark Depository Library (PTDL) is a library designated by the U.S. Patent and Trademark Office (PTO) to receive and house copies of U.S. patents and patent and trademark materials, to make them freely available to the public, and to actively disseminate patent and trademark information." (USPTO PTDL site)