The US Patent and Trademark Office web site is:
http://www.uspto.gov

The US Copyright Office web site is:
http://www.copyright.gov/

The European Patent Office web site is:
http://www.epo.org/

The European Patent Office Worldwide Patent Search Database web site is:
http://www.spacenet.com/

The Japanese Patent Office web site is:
http://www.jpo.go.jp/

The World Intellectual Property Organization web site is:
http://www.wipo.int/