World Intellectual Property Organization(WIPO) - wipo.int
Indian Patents' Database - patinfo.nic.in
American Patents' Database - patft.uspto.gov
Intellectual Property India - ipindia.nic.in
Japanese Patent Office - jpo.go.jp
European Patent Office - epo.org
Indian Copyright Office copyright.gov.in
Duke University guides.library.duke.edu/patent
Oppedahl & Larson Patent Law Webserver www.patents.com
Standford University www.sul.stanford.edu
University of Texas Engineering www.lib.utexas.edu
Classification of Patents www.ibiblio.org
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WIPO Patentscope wipo.int
Google Patents www.google.com/patents
Japan Patents JPAT
European Patents Esp@net
Australian Patents AUSPAT
Fulltext Patent Database PATFT
IBM Patent Search wipo.int
Micropatent www.micropat.com
Nexis Uni www.leisnexis.com
SciFinder www.scifinder.cas.org
EDS Shadow Patent Office www.spo.eds.com
Compendex/Engineering Village www.engineeringvillage.com
Dialog www.dialog.com
Matheo-software www.matheo-software.com
Patentanalysis www.patentanalysis.org
Patseer www.patseer.com