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About patents About patents	Austrian Patent Office Austrian Patent Office
Canadian Intellectual Property Office Canadian Intellectual Property Office	Chemical Patent Searching Chemical Patent Searching
Chemical Patents Watch Chemical Patents Watch
DEPATISnet DEPATISnet
Derwent Derwent
Deutsche Patentamt Online Deutsche Patentamt Online
esp@cenet esp@cenet
European Patent Office European Patent Office	Five Hundred Years of Patents Five Hundred Years of Patents
General Information Concerning Patents General Information Concerning Patents	GetIPDL GetIPDL
IFI Claims patent service IFI Claims patent service	Information on Patents for Researchers Information on Patents for Researchers
Information Specialties Information Specialties	Institut National de la Propriete Industrielle Institut National de la Propriete Industrielle
Instituto Nacional Propriedade Industrial Instituto Nacional Propriedade Industrial	Irish Patents Office Irish Patents Office
Japan Patent Office Japan Patent Office	MicroPatent MicroPatent
Organic Chemistry and Patents Organic Chemistry and Patents	Outline of the Industrial Property Rights system Outline of the Industrial Property Rights system
P\S\L Consulting Group Inc. P\S\L Consulting Group Inc.	Patent information on the Internet Patent information on the Internet
Patent Information Users Group Inc Patent Information Users Group Inc	Patent it Yourself Patent it Yourself
Patent Resource Site Patent Resource Site	Patentdirektoratet Patentdirektoratet
Patents TM Patents TM	STO"s Internet Patent website STO"s Internet Patent website
The British Library - Collections, Patents, trade marks & designs The British Library - Collections, Patents, trade marks & designs	UK Patent Office UK Patent Office
US Patent Classes - Chemical Group US Patent Classes - Chemical Group	US Patents Office US Patents Office
Who Owns What Intellectual Property, Copyright, and the Next Millenium Who Owns What Intellectual Property, Copyright, and the Next Millenium