If you want to sell your idea / device, I would recommend NOT searching for patents that you'd infringe on.
Specifically, if you infringe on their patents KNOWINGLY, you're liable for triple damages.
The other thing you can do is file a provisional patent application. This will give you a year to sell your idea and be able to claim "patent pending" while still not filing for the real thing.
A book I'd recommend is Patent It Yourself
http://www.amazon.com/Patent-Yoursel...0352096&sr=8-1
So you can at least get some background on what you're doing.
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