A Patent and Trademark Depository Library (PTDL) is a US Patent 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. To be designated, a US Patent Library must meet the specific requirements and promise to fulfill the obligations outlined in the information brochure entitled Notes on Becoming a Patent and Trademark Depository Library.
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