A chapter 7 bankruptcy filing does not dissolve a corporation or cause it to cease to exist--which is not to say that companies may not be dissolved more or less simultaneously (or just after) a chapter 7 filing, but the one does not lead to the other. Therefore, in the first instance, there is no reason why the bankrupt company is not extant and you cannot resume operations under its name. And if the bankrupt corporation had been disolved, then the name should be available for use.