Some useful patent-search related links:
The United States Patent and Trademark Office is here: http://www.uspto.gov/patft/
Google Patent Search is here: http://www.google.com/patents (The last time I checked, 7 million patents were included)
Inventions Patents
Invention by a six year old – the Super Duper Cat Saver
Ever tried to get your pet cat off a tree? You know how hard it is. Now, it should be a cakewalk, thanks to Cohen Hodge, a six year old kid from Chango Elementary School, who has invented a cat cage, which he calls the “Super Duper Cat Saver”. The cage has a stick attached to it, and, there is a catnip inside.
Read about this here.