My last company was a acquired by a company based in California. Under CA law, you are entitled to your own IP if done on your own equipment. So, I had a separate laptop. The employment agreement had a clause where you were to list all of the IP that you had owned. But, it was ambiguous about whether I was retaining ownership or turning it over to the new company. So, I asked their legal: am I listing what's mine or what's yours? The reply was an ambiguous "yes". I quit after 1 day. A colleague, with the same issue lasted for a month.
