Look, unless that patent was purchased/given back to ABHI "Nunc Pro Tunc" then I don't see how they can win a law suit claiming royalties/licensing fees are due to them for something they didn't own at the time.
Let me put it this way. If my house was taken away and the subsequent owner rented the house during the time I had lost ownership, I would have no claim to the rental payments as I didn't have an ownership interest in the property during that time even if I were to buy the house back at a later date.