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In reference to the patent: US5222141

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Maintaining a patent costs money. Those fees have to be paid regularly or the patent "dies".

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  • So this is what is occurring? Sep 11, 1996 FPAY Fee payment Year of fee payment: 4 Sep 29, 2000 FPAY Fee payment Year of fee payment: 8 Sep 29, 2004 FPAY Fee payment Year of fee payment: 12
    – M Killian
    Dec 14, 2016 at 20:06
  • Yes, that means that the fees were paid.
    – user18033
    Dec 14, 2016 at 20:09

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