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Hilfsmittel Patentrecherche


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IPC Internat. Patentklassen EN, FR WIPO http://www.wipo.int/classifications... 
USPC-to-IPC Reverse Concordance USPTO http://www.uspto.gov/web/patents... 
DWPI Patentklassen Thomson Reuters Derwent http://www.stn-international.com... 
EMC Electrical Patents Index Manual Codes Thomson Reuters Derwent http://science.thomsonreuters.com... 
Dokumentenartcodes DE, EN STN International http://www.stn-international.com... 
Japanese Patent Classification IPDL http://www5.ipdl.inpit.go.jp/pmgs1/... 
DWPI Patent Assignees / Company Codes Thomson Reuters Derwent http://science.thomsonreuters.com... 
US Patent Classification USPTO http://www.uspto.gov/web/patents/classification/ 
ECLA Europäische Patentklassen EN EPO http://worldwide.espacenet.com/eclasrch?... 
CPC - Cooperative Patent Classification EPO + USPTO http://www.cooperativepatentclassification.org/ 
IPC Internat. Patentklassen DE, EN, FR DPMA http://depatisnet.dpma.de/ipc/ 
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