Here is a link to the USPTO's FAQ page.
Link Below is the second paragraph from FAQ #51
#51 What is a patent?
A patent cannot be obtained on a mere idea or suggestion. Patent applications are examined for both technical and legal merit. Prior to filing a patent application, a search of existing patents can be conducted at the USPTO Patent Search Room or at a Patent and Trademark Depository Library in your area. For additional information on patents, you may visit the USPTO Web site at /www.uspto.gov/main/patents.htm.