http://www.jpo.go.jp/indexj.htm
http://www.ipdl.ncipi.go.jp/homepg.ipdl
http://www.jpaa.or.jp/
http://www.jiii.or.jp/
http://www.uspto.gov/
http://www.european-patent-office.org/index.en.php
http://www.wipo.int/portal/index.html.en
http://www.tomon-benrishi.com/