Patents  

Major Patent Databases

U.S. Patents 

The European Patent Database 

Patent Abstracts of Japan Database 

World Intellectual Property Organization Patent Cooperation Treaty PatentScope Portal  

Google Patents 

Boliven Patents

DEPATISnet 

FreePatentsOnline

Patent Lens 

Searches patent family trees.

 Other Patent Databases

Patents at the British Library 

United States Patent Office Electronic Official Gazette 

Delphion Intellectual Property Network 

MicroPatent Web Services 

Plant Variety Protection Office Public Access Databases

QPAT-U.S. Welcome Page 

Canadian Patents Database

Pat2PDF

FreePatentsOnline.com 

Historic U.S. Patents Index 

Global Innovation Index

Wall Street Journal Patent Scorecard http://www.wsj.com

Found under (Market Data/Calendars & Economy)

 Information About Patenting Inventions

How to Conduct a Preliminary U.S. Patent Search: A Step by Step Strategy 

Invention Promotion Firms 

Offers information to inventors on detecting and avoiding fraudulent invention promotion scams.

National Inventor Fraud Center

IP Webguide 

UK Patent Office 

World Intellectual Property Organization 

 Patent-related Organizations

Patent and Trademark Depository Library Association 

American Intellectual Property Law Association

Thomson CompuMark 

National Association of Patent Practitioners

Patent Information Users Group

Software Patent Institute 

 Trademarks

USPTO Web Trademark Database 

 Copyright

Copyright Office 

 Fun with Patents

invention at play 

USPTO Kid's Pages