As you said, it is generally done as a percentage of future sales. However, you could try and estimate future sales. Then you could negotiate to get that money upfront at a discount. For example, if you were to receive 1% of future sales, and that would net you $100,000 over the net 10 years. You could offer to accept a single payment today of $50,000.
My suggestion, is that you contact a firm the handles selling manufacturing patents. They should be able to help you with how much you patent is worth and how to best monetize it.
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