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Is it for all of the world or only for USA? What kind of troubles can I face in case if I start business related to this patent in another country?
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This patent is US issued which means it covers the US only. However, the inventor may have also patented it in other countries which would then cover their respective territories. In addition, there may be child or parent applications which may have been issued separate patents:
This particular US patent seems to have expired:
In some cases the inventor can pay the fees and get it resurrected again.