In reply to mike kann:
IANAL, but I'd guess that the brand name will still be locked down and trademarked, probably buried somewhere in the collection of assets that one of their creditors took when they went out of business.
The danger is that if you use that brand name and become successful then the creditor in question will remember that they actually own that name, and give you the choice between paying them to continue using it or completely rebranding (thereby undoing a lot of work that you've put in building up a reputation etc). Since the latter option could be a major pain in the arse, they'll probably feel like they can set a fairly high price.
You might have better luck tracking them down now and buying the brand name off them at a cut-down price before you've got too much bound up in it - ie when they'll see an opportunity to make a little bit of cash for free, rather than to hold you to ransom for loads.