中国:国家知识产权局的法律状态检索:http://search.sipo.gov.cn/sipo/zljs/searchflzt.jsp
美国:美国专利商标局(USPTO):home(USPTO的首页)-patent-view in pair-pubic pair(http://portal.uspto.gov/external/portal/pair)
欧洲:epoline的Register plus:httphttp://www.epoline.org/portal/public/!ut/p/kcxml/04_Sj9SPykssy0xPLMnMz0vM0Y_QjzKLN4i3dAHJgFjGpvqRqCKOcAFfj_zcVKBwpDmQ7xmo760foF-QGxpRnu6oCAB5BFBb/delta/base64xml/L3dJdyEvd0ZNQUFzQUMvNElVRS82XzBfOUc! |