[mordrax]

Thank you all for the wide range of thoughtful responses.

I don't want to leave the impression that this company with a private owner is a bad company. The employer did look out for me when I had difficult family issues and at one point, being way over-burdened with the workload, I told him to either fire me and get a support person at half my salary or give me more resources.

Being laid off there was quite good for me. I felt indebted to keep the product afloat but it was burning me out constantly so after I left, I got a higher paid, much more reasonable hours job with peers that also have passion for coding.

But I still remembered him looking out for me so I want to do the right thing and help him get some closure on this business. To that end, I think getting a IP lawyer to put any of my worries to rest at a small expense to him or the purchasing company is the most reasonable option as someone else had said below.