This is really an intellectual property and employment question. If you signed off on the work you did as a work for hire, they own it and you would be violating their copyright if you were to continue to use it. If you did not sign off, in writing, for this you may still have rights to the work. Regarding the name of the company. This is a trademark. Regardless of whether they registered the name as a business, it may be a registered trademark or they may continue to maintain rights to the name. I recommend that you contact a qualified intellectual property attorney for a full evaluation.
Answered on Dec 09th, 2012 at 7:14 PM