One of my college buddies specializes in patent law - he works for himself and stays busy at $250/hour.
So a person has to be pretty sure of the idea to hire him to get the patent.
You might want to research your idea first to make sure there is no prior art work or reference to anything similar - if there is, it will drastically affect you being able to obtain a patent.
Here is the main gov site with a lot of good info:
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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