When a patent was filed by a company that no longer exists, what is the best way to find out its current owner?
In my case the company that filed the patent at the time first merged with a second company. The resulting company then sold some of its assets (most of them corresponding to the initial company) to multiple other companies. So it's very hard to guess who owns the specific patent.
When looking at the patent history I can't find any information on any owner change, and I'm not actually sure this information is available anyway.