Patent Lens is a free patent search system developed by CAMBIA.  Read the full System Report at Intellogist:  http://www.intellogist.com/wiki/Report:Patent_Lens/System_Data

Patent Lens is a free patent search system developed by CAMBIA. Read the full System Report at Intellogist: http://www.intellogist.com/wiki/Report:Patent_Lens/System_Data

Espacenet is a free search service offered by the European Patent Office (EPO). The major data source used by Espacenet is the DOCDB bibliographic and legal status data file, which is also used to create the bibliographic backbone of most commercially available subscription databases.  Read the full System Report at Intellogist:   http://www.intellogist.com/wiki/Report:Espacenet/System_Data

Espacenet is a free search service offered by the European Patent Office (EPO). The major data source used by Espacenet is the DOCDB bibliographic and legal status data file, which is also used to create the bibliographic backbone of most commercially available subscription databases. Read the full System Report at Intellogist: http://www.intellogist.com/wiki/Report:Espacenet/System_Data

FreePatentsOnline (FPO) is a free patents search system aimed at novice to advanced patent searchers. Read the full System Report at Intellogist: http://www.intellogist.com/wiki/Report:FreePatentsOnline

FreePatentsOnline (FPO) is a free patents search system aimed at novice to advanced patent searchers. Read the full System Report at Intellogist: http://www.intellogist.com/wiki/Report:FreePatentsOnline

Zhihuiya.com is a free Chinese patent search site, created by Wisdom buds Information Technology (Suzhou) Co., Ltd, which allows users to search US patents, Chinese patents (including design and utility model), EPO patents and applications, PCT applications, Korean patents, Japanese patents, and Norwegian patents.  Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Zhihuiya.com

Zhihuiya.com is a free Chinese patent search site, created by Wisdom buds Information Technology (Suzhou) Co., Ltd, which allows users to search US patents, Chinese patents (including design and utility model), EPO patents and applications, PCT applications, Korean patents, Japanese patents, and Norwegian patents. Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Zhihuiya.com

Invenes is the free patent search system provided by the Spanish Patent Office. Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Invenes_(Spain_Patent_Search)

Invenes is the free patent search system provided by the Spanish Patent Office. Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Invenes_(Spain_Patent_Search)

Patexia is a "a privately-held company based in Los Angeles" that released a free version of it's IP Research database and visualization tools on their website. Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Patexia

Patexia is a "a privately-held company based in Los Angeles" that released a free version of it's IP Research database and visualization tools on their website. Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Patexia

Patent Genius is a free patent search system that "has full text patent descriptions, lists of patents by inventor and companies that hold patents, the ability to view all patents in any class or category," and allows users to browse patents by category (US classification), inventor, patent holder, patent number, or date (1976 onwards). Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Patent_Genius

Patent Genius is a free patent search system that "has full text patent descriptions, lists of patents by inventor and companies that hold patents, the ability to view all patents in any class or category," and allows users to browse patents by category (US classification), inventor, patent holder, patent number, or date (1976 onwards). Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/Patent_Genius

PATENTSCOPE® is a free search service offered by the World Intellectual Property Organization (WIPO). Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/PATENTSCOPE

PATENTSCOPE® is a free search service offered by the World Intellectual Property Organization (WIPO). Read the full Community Report at Intellogist: http://www.intellogist.com/wiki/PATENTSCOPE

Google Patent Search is a free US patent  document search service provided by Google. Read the full System Report at Intellogist:  http://www.intellogist.com/wiki/Report:Google_Patent_Search

Google Patent Search is a free US patent document search service provided by Google. Read the full System Report at Intellogist: http://www.intellogist.com/wiki/Report:Google_Patent_Search

SumoBrain is a free patent search system aimed at novice to advanced patent searchers. Read the full System Report at Intellogist:  http://www.intellogist.com/wiki/Report:SumoBrain

SumoBrain is a free patent search system aimed at novice to advanced patent searchers. Read the full System Report at Intellogist: http://www.intellogist.com/wiki/Report:SumoBrain

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