There was a recent thread on this forum about the Big Boy brand:
http://www.roadfood.com/Forums/topic.asp?TOPIC_ID=15250

I think it would take a trademark attorney, however, to accurately advise us about this brand. The business dealings were just so convoluted.

There are also plenty of threads in which the Big Boy hamburger itself is discussed. However, because Big Boy is such a common name, you will gets lots of hits when using the search function.