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We have patent #5,853,128 which was applied for on Mar. 8, 1997 and issued on Dec. 29, 1998. We missed paying the final maintenance fee and have not tried to get it reissued before now. How long do we have before there is no way to get it reissued in any way?

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    Possible duplicate of patents.stackexchange.com/q/14657/18033
    – user18033
    Mar 30, 2017 at 21:35
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    I'd guess it would have expired on March 8th of 2017 so does it matter at this point?
    – Eric S
    Mar 31, 2017 at 13:13

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The patent was pre-AIA, and therefore the best-case scenario is that it expired 17 years after issue. Therefore, as of Dec. 29, 2015, the patent is irretrievably in the public domain.

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