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Failure to pay maintenance fees

If an inventor submittes an idea and it has been accepted, and he makes no tangible device (it remains intellectual rather than carried out). But then the inventor does not pay the maintenance fees, ...
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My patent expired before I successfully marketed it, can I successfully market it?

My patent expired some years back. I was not knowledgeable as to how to market it back then. Could I create a new version of it and patent that? I know I could easily market it, as is, on Youtube now. ...