Since it is a Civil case it may be hard to find an attorney to represent you for free. If I were you I would go see several attorneys and plead my case to them. Many will give you a free initial consultation and hopefully one of them will see what you see in your case and may try to help you. Also ask friends who may have attorney friends. I believe attorneys have to do a bit of "pro bono" (for free) work but I am not sure how much and how often, so just ask a few what they think. Good luck.
A consultation doesn't cost much but securing a patent costs quite a bit. An initial consultation may be free or a discounted amount. I charge $150 for a half hour or $300 for an hour initial consultation. Filing a patent application, depending on the technology, costs an average of about $8500 or so depending on the complexity, but that is just to file it, and only in the USA. Start to finish, it can cost around $35,000 to secure a patent, depending on how difficult the examiner is being.