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. ...
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, ...
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 ...