Espacenet 日本語
http://worldwide.espacenet.com/?locale=jp_JP (2013/01/23確認)
Espacenet
http://worldwide.espacenet.com/ (2013/01/23確認)
WIPO 日本語
http://patentscope.wipo.int/search/ja/search.jsf;jsessionid=C7422D190146FA865C902BAF65F99DC4.wapp2
WIPO
http://patentscope.wipo.int/search/en/search.jsf (2013/01/23確認)
特許電子図書館 IPDL
http://www.ipdl.inpit.go.jp/homepg.ipdl (2013/01/23確認)
United States Patent and Trademark Office
http://www.uspto.gov/ (2013/01/23確認)
Google Patent Search
http://www.google.co.jp/?tbm=pts (2013/01/23確認)
諸外国の特許庁ホームページ
http://www.jpo.go.jp/kanren/others.htm (2013/01/23確認)
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