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US3331802A - Polyesters from dibasic acids

                                               
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Search - United States Patent and Trademark Office

                                               
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  • What is patent public search?
  • The Patent Public Search tool is a new web-based patent search application that will replace internal legacy search tools PubEAST and PubWEST and external legacy search tools PatFT and AppFT. Patent Public Search has two user-selectable modern interfaces that provide enhanced access to prior art.
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  • For questions regarding Patent Public Search, please contact the Public Search Facility at psf@uspto.gov. New to Patent Searching?
  • See this important information about searching for patents: How to Conduct a Preliminary U.S. Patent Search: A Step by Step Strategy - Web Based Tutorial (38 minutes)
  • Where can I find information about Chinese patents?
  • (CNIPA) - This site also provides access to machine translation of Chinese patents. Stopfakes.Gov provides informative Toolkits that give an overview of the Intellectual Property Rights (IPR) environment in various countries around the world.
  • Where can I find free online patent databases?
  • Free online access to patent collections is provided by many countries. Some available databases include: a network of Europe's patent databases- This site also provides access to machine translation of European patents for some languages. (JPO) - This site also provides access to machine translations of Japanese patents.