Intellectual Property Guide

Intellectual Property Corporation of Malaysia (MYIPO)
http://www.myipo.gov.my/

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World Intellectual Property Organization (WIPO)
http://www.wipo.int/portal/index.html.en

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Intellectual Property Office of Singapore (IPOS)
http://www.ipos.gov.sg/

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European Patent Office (EPO)
http://worldwide.espacenet.com/

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The Industrial Property Digital Library (PAJ)
http://www19.ipdl.inpit.go.jp

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United States Patent & Trademark Office (USPTO)
http://www.uspto.gov/patft/index.html

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An Open Resource for Innovation (IOI Lens)
http://www.patentlens.org

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Google Patents 
https://patents.google.com/

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