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  1. United States Patent and Trademark Office

  2. Patent Public Search | USPTO - United States Patent and …

  3. Search for patents | USPTO - United States Patent and …

  4. Patent Public Search Basic (PPUBS Basic) - United States Patent

  5. Google Patents

  6. Patent Center

  7. U.S. Patent and Trademark Office | U.S. Department of Commerce

  8. Patent Public Search | USPTO - extended window - United States Patent ...

  9. United States Patent and Trademark Office - Wikipedia

  10. United States Patent and Trademark Office - Search USPTO.gov