Search U.S. Patent & Trademark Office website for your invention or proposed trademark
http://www.uspto.gov

U.S. Copyright Office/The Library of Congress
http://www.copyright.gov

Visit the American Intellectual Property Law Association (AIPLA)
http://www.aipla.org

IP Law 360
http://ip.law360.com

Vermont Bar Association
http://www.vtbar.org

Visit the National Inventor Fraud Center
http://www.inventorfraud.com