 Free patent site
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 Japan Patent Office(JPO)
"Industrial Property Digital Library" IPDL（INPIT）
Searching PAJ (Patent Abstract of Japan)
INID code table (WIPO)
Patent Map Guidance（patent classification concordance)
FI/IPC/ECLA/USC patent classification concordance (JPO)
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| United States Patent and Trademark Office(USPTO)
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Retrieval of US CLASS
CPC ⇔ USPC concordance
Expired Patent Search
Patent Assignment DB
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| Patent Application Information Retrieval (PAIR)
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| Official Gazette retrieval
Official Gazette(OG)
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| Board of Patent Appeals and Interference (BPAI)
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| Europe Patent Office (EPO)
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espacenet
European publication server
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Register Plus(ID login)
Patent Register
trial decision
PRS legal code
Asian patent information
(CN,TW,IN,JP,KR)
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German Patent Office
German patent retrieval（English interface）
Field Search
Expert Search
family Search
Legal Status
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| WIPO
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WIPO GOLD New retrieval screen(2010)
Simple Search
Advanced Search
Cross Lingual Expansion(English, German, Spanish, French, and Japanese）
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| PATENT SCOPE（Advanced Search）
Structured Search
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| IPC classification table
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| Korean Patent Office (KIPO)
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・Korea Intellectual Property Rights Information Service (KIPI)
Hangul retrieval (KIPRIS)
English retrieval
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State Intellectual Property Office of the PRC
English retrieval
Chinese retrieval
Legal Status
payment situation
applicant data base（password required）
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| ・Intellectual Property Protection in China
China IP Law Search
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| ・CNIPR
English retrieval
Chinese retrieval
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| ・Intellectual Property of Shaghai
Shanghai IPO patents retrieval
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| ・China Patent Information Center(中国専利信息中心)
English retrieval
Chinese retrieval
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Other Chinese retrieval sites
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・Intellectual Property Department The Government of the Hong Kong Special Administrative Region
(香港特別行政区･知識産権署)
patent retrieval
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・Baidu（patent retrieval）
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| ・Zhengzhou University Online Science and Technology Dictionary (鄭州大学・英漢・漢英科学大詞典)
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| ・Gensen Web(Chinese version)
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Taiwan Patent (経済部智彗財産局)
Traditional Chinese retrieval
English retrieval
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| ・WEBPAT（Taiwanese patent retrieval: commercil）
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Intellectual Property INDIA
Patent retrieval
PATENT OFFICE JOURNAL
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・PATENT FACILITATING CENTRE
issue patent, opposition, trial decision（1995〜2004）、Official Journal（2005〜2007）
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| ・CiPIS(IN)
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| Asia and other country
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| Intellectual Property Office of SINGAPORE
patent retrieval
SUIF IP
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| Intellectual Property Office of INDONESIA
patent retrieval
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| National Office of Intellectual Property of VIETNAM
patent retrieval
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| Intellectual Property Office of MALAYSIA
patent retrieval
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| Intellectual Property Office of THAILAND
patent retrieval
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| Intellectual Property Office of PHILIPPINES
patent retrieval
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| Intellectual Property Office of BRAZIL (INPI)
patent retrieval
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| Intellectual Property Office of RUSSIA
patent retrieval
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| KACST
Saudi patent retrieval
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| ・Patent information on Asia(知財部調査室)(Japanese)
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| ・Patent Coverage of Asian（Japan Association for International Chemical Information as of March 21, 2013）(Japanese)
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| Foreign country patent free retrieval site（Only two or more country retrieval site）
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| ・freepatentsonline USP,EP,WO
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| ・ULTRA Patent JP,US,EP,WO,CN,KR,DE,FR,GB
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| ・Patent Integration JP,US,EP,WO,CN,TW,KR,MX (Features include a Patent Map)
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| ・BOLIVEN US,EP,WO,KR,JP,INPADOC
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| ・IP News flash patent family retrieval
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| ・Patent Lens US,EP,WO,AU
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| ・Patents.com US,EP
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| ・patsnap US,EP,WO
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| ・SUMOBRAIN
field search US,EP,WO,PAJ
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| ・Patentics US,EP,WO,CN
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| ・pat365 US,EP,WO,GB,CH,JP,CN,TW,HK
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| ・SooPAT
Chinese retrieval
worldwide
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| ・PriorIP
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| ・SIP Patentsearch US,EP,PCT,GB,DE
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| ・Intellogist (evaluation of various databases)
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