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That's a really broad question, and it's going to depend on how the patent was drafted and filed. It's possible that each individual process is patented; or some of the processes; or all of them, collectively. It's also going to depend on how close of a result that your process has to the patented process.
Here is a link to the US Patent and Trademark Office: http://www.uspto.gov/. Depending on the age of the patent or patents in question, that information may be available on line.
If it isn't available on-line, you should get in touch with a patent attorney to evaluate the situation for you. Patent attorneys have specialized degrees in science and pass a patent exam to qualify as patent attorneys.
I'm sorry I can't be more definite for you on this answer.