USPTO - United States Patent and Trademark Office
EPO - European Patent Office
JPO - Japanese Patent Office
WIPO - World Intellectual Property Office
UK Patent Office
German Patent Office
Canadian Patent Database
Trilateral Web Site (EPO, JPO, USPTO)
Trilateral Patent Database (links to EPO, JPO and USPTO portions)
National Intellectual Property Offices Worldwide
Forms
USPTO Forms - United States Patent and Trademark Office
PCT Forms - Chapter 1
PCT Forms - Chapter 2
Other Resources
LexisNexis
National Association of Patent Practitioners
If you have a resource you'd like to see listed here, please let us know.