Billy B is right.
I worked in the intellectual property group of a Fortune 100 company for a while and
it is a tough business. Look at the IP fight the PC had with DeWalt of thier biscuit
joiners. Before using a patent attorney do a little footwork your self. Check out
the patents (usually listed on the product or box) on an online patent database. The
patent will usually refer to "prior art" or other similar types of inventions and
will also refer to other patents. You will: 1) se if you really have a unique idea,
2) gte an idea for a workaround to differentiate your idea from others and 3) get
ideas on what is happening in the field.