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USPTO
Patent Full-Text and Image Database
The US Patent and Trademark Office (PTO) offers World-Wide Web (Web)
access to bibliographic and full-text patent databases.
WIPO
International Patent Applications
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FreePatentsOnlinePatent
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patent search engines on the web
European
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Korean
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KIPRIS is an internet-based patent document search service which is
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Japan
Patent office
Japan patent office site and information on patents
Patent
data
Resources Patent data resources at the EBI contains patent
abstracts, patent chemical compounds, patent sequences and patent
equivalents. There are various ways of accessing and searching the
patent data