In 2011 you obtain a patent wholly owned by the company.
In 2012 you fail to pay the franchise tax and filing paperwork for your company so the state dissolves it. You don't care because you aren't making money.
In 2013 another company starts making a product that infringes on your patent.
You are the defacto owner of the patent. This is because you were the owner of the company when it was terminated. All of its assets and liabilities devolved to you. No action was required of you for this to happen, it just happens.
Now imagine this business was actually a joint venture between two wholly owned subsidiaries of two different holding companies, one of which was public but has gone bankrupt and the other was private but subsequently merged with a public conglomerate that spun off a child company, keeping only 40% of its stock after IPO.
The patent is still owned by people, but good luck finding them all.