European Patent Office
The EPO's official website contains many useful resources for applicants, and keeps abreast of the latest developments in European patent decisions.
Japanese Patent Office
The Japanese Patent Office's website (in English).
Korean Patent Office
The Korean Patent Office's Website
The website of the Office for Harmonization in the Internal Market
(European Community trade marks and designs).
UK Intellectual Property Office
The UKIPO's website contains much background IP material, and is host to UK patent, design & trade mark databases.
US Patent and Trade Mark Office
The USPTO's official website
The World Intellectual Property Organisation.
The World Trade Organisation.