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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1answer
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Failure to pay maintenance fees

If an inventor submits an idea and it has been accepted, and he makes no tangible device (it remains intellectual rather than carried out). But then the inventor does not pay the maintenance fees, ...
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1answer
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Patent issued in 2005 and now is ceased/expired due to failure to pay maintenance fees

If a patent has been claimed expired/ceased due to failure to pay maintenance fees, and I come in and assign the patent to myself (is this possible) I would also pay all the fees up to date. The ...