Oh dang, that's awesome. If only I had it 5 years ago...
I actually just want to walk away, my point was more about how can I politely tell you that I don't want to do this anymore? Not so much the legal ramifications of who owns what.
Can't you just say that you've lost interest and want to do something else with your life?
Worked just fine for me at my previous company- client base shrunk to almost nothing and while we could still pay the bills and our salaries, I quit the company and moved to embedded software/hardware. Probably my best decision career-wise.