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Entrepreneurship

Google Patent Search

Patent & Trademark Offices

US Patent and Trademark Office
It has a patent full-text and image database, as well as instruction for filing for a patent. Site also has extensive information on trademarks and intellectual property law and policies.
European Patent Office
European, Japanese, & World Patents
Canadian Intellectual Property Office
Canadian patent records from 1869 and full text documents from 1920 to the present.

Citing Patents

How to cite a patent
Provides information on how to cite a patent in several styles.

Free Web Resources

PatentScope (WIPO)
Database published by World Intellectual Property Organization. Search for international patent applications from 1978 to present.
Lens.Org
Search for US and Global patents