Patents for sale are patent rights granted to an inventor that are being sold in public. Patents for sale companies specialize in allowing companies and individuals to buy or sell ideas, new inventions and patents as well as art, crafts and other intellectual properties. Patents for Sale companies provide a link of the innovators with investors and manufacturers as well as agents, galleries and publishers who have the resources to market new ideas and talents at the worldwide level.

These companies that offer patents for sale can help leverage the massive reach of the global network, and promote the innovation and talent to the worldwide intellectual property transfer market which is now estimated to be worth over $100 billion.

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.