this outdated edition). But there is no legal basis for you to "reclaim" your rights based on the current owner's inactions.
You can "grab" some rights if ... If you had created the games independently and transferred rights to the company, you could reclaim copyright 35 years after the transfer. (Here's more on the 35 year reversion rule.) But that's probably not the case if you're an ex-employee. The original company would own those rights with no right of reversion. Alternatively, anyone (not just you and the other ex-employees) can claim any trademarks (for example, the videogame names) if the current company has stopped exploiting the games and has no apparent intention to resume. (Here's more on trademark abandonment.)
Course of action. If you think there's a chance the games can make some money perhaps the company would be more responsive if you offered them a deal -- for example, you'll grant them a royalty of future revenues. (PS Try to avoid providing an advance to keep your risk factor down.)