Maintenance of patents is the payment of fees to maintain the right in force.

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Is an expired patent in the public domain?

From what I've been reading about US patents, once a patent has expired, it enters the public domain and can be freely used. The patent I was looking at was filed on 1/1999 and published in 10/2000. ...
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Patent Application 20120173688

What's novel about Patent Application US 20120173688 ? Is there prior art?
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Prior Art for Method And System For Improved Network Maintence Scheduling

Application # 20120173688 Primary Filing Category-Telecommunications-455 The system is designed to coordinate planned maintenance on a network in order to prevent collisions and duplicated work ...
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Has us6072466 expired due to non-payment?

I have checked uspto.gov and looking up the paying of the maintenance fees gives No fees paid for selected year - MF Stmt unavailable Which I am not sure is an error or whether it means the ...
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Can an expired patent be reinstated if the inventor of the patent has died?

Can an expired patent be re-instated if the inventor of the patent has died? Background: The inventor died 3.5 years ago. I am not sure who the patent was passed onto upon his death but the patent ...