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I am curious about this product and wondering if this patent is still valid even though it is over a hundred years old.

In reference to the patent: US621888

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    Both patents have expired. The US5653413 "Patent Expired Due to NonPayment of Maintenance Fees Under 37 CFR " as is indicated in public PAIR. The US621888 has expired a long time ago.
    – john
    Sep 22, 2015 at 10:36
  • @john If you have an answer, please post it below.Thanks.
    – Robert Cartaino
    Sep 23, 2015 at 13:05
  • @JustinSasse please mark the question as answered if the answer is satisfactory.
    – john
    Sep 29, 2015 at 11:15

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Both patents have expired. The US5653413 "Patent Expired Due to NonPayment of Maintenance Fees Under 37 CFR " as is indicated in public PAIR. The US621888 has expired a long time ago. Haven't found any specific indication of that but according to wiki the longest period for patent validity was 21 years and it's way beyond that now.

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