IIRC, it is not a patent issue, but one of ‘trade dress’. The point of contention was the top-mounted tweeter. I don’t know how this was resolved or if it was. For sure the Swan models that may have had this issue are still being marketed and sold.
They must have come to some agreement, because I do still see those Swans being sold, even with the new line out. There are other companies out there who also use the same tweeter apperance, so I know it isn't a simple matter of how it looks.