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• 中國專利信息中心

  http://www.cnpat.com.cn/
  

  carlos 2009-02-10 13:30

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• Website has permanently moved! - European Patent Office

  http://www.european-patent-office.org/espacenet/info/access.htm
  

  carlos 2009-02-10 13:30

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• PatFT _ Page 1 of 1

  http://patft.uspto.gov/
  

  carlos 2009-02-10 13:30

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• Delphion Research intellectual property network - international and US patent search database

  http://www.delphion.com/
  

  carlos 2009-02-10 13:30

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• CPD

  http://patents.ic.gc.ca/cipo/cpd/en/introduction.html
  

  carlos 2009-02-10 13:30

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