Patents Trademarks and Copyrights

U.S. Copyright Office Home Page
http://lcweb.loc.gov/copyright/

IBM Intellectual Property Network
http://www.patents.ibm.com/

Invention Connection (R) Cyberspace Convention
http://www.inventionconnection.com

Detroit Public Library - Great Lakes Patent and Trademark Center
http://www.detroit.lib.mi.us/specialservice/patent-and-trademark-resource-center-ptrc​