In reference to the patent: US5222141
1 Answer
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 Dec 14, 2016 at 20:06
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Yes, that means that the fees were paid.– user18033Dec 14, 2016 at 20:09