Auto Insurance claim We had a drunk driver slam into our vehicle while stopped…

Auto Insurance claim
We had a drunk driver slam into our vehicle while stopped at a traffic light totaling the car. He carried a non owned auto policy with company A. The owner of the vehicle carried an active policy with company B. Company A explained their policy was excess and that the carrier on the owned vehicle is primary. They declined to take responsibility. Then the owner produced a bill of sale dated within the past 30 days to his carrier (company B) Company B declined to take responsibility for damages as their client sold the car to the driver prior to the accident and is not legally liable. At what point does legal ownership of the vehicle transfer from seller to buyer? The buyer made his first payment in 2007, so company A is now refusing to accept responsibility because their insured is beyond the 30 day period to report ownership of the car. However the bill of sale is dated within the past 30 days. No title has been applied for. Nor has the DMV been notified. The license plates are still registered to the seller and still on the vehcile. In addition, the seller still paid an insurance premium for the vehicle under his own policy. Two insurance carriers and both declining to accept legal responsibility.

Selling a Used car – ownership transfer?

Selling a Used car – ownership transfer?
When selling a used car – does ownership transfer when the vehicle is paid for, vehicle is exchanged, and bill of sale produced or is it when the title is actually transferred? I already sold a car, and am waiting on the title now. Do I still own the car?