Check with an attorney who specializes in patent law. I wouldn't be surprised if some offer to do the work "for free" if they get a cut of future profits. I know that's how those "inventors companies" (the ones you see on TV, saying "call now for your free information book!") work, but maybe you can get a better deal elsewhere.
Of course, if you have the bucks and are willing to invest, then just pay the lawyer for the service and keep whatever you make.
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A little silliness now and then is cherished by the wisest men. -- Willy Wonka
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