You are again confused. First of all, so-called "sulfur" batteries still use lithium; they're technically lithium-sulfur batteries:You are incorrect. Try looking up Sulfur battery chemistries. There is already one EV using them.
And there isn't an EV on the planet using them. There's one startup company attempting to bring them to market, and even they say it is at least two years before they'll be available for automotive applications.
Given the track record of other li-ion competitors, I'd give this firm no more than a 50% chance of *ever* successfully bringing these to market.
No, I'm entirely correct. The patent domains and public domains are mutually exclusive. You cannot patent material in the public domain. The law is as clear as it gets:Legal code is very complicated and is NOT as cut and dried as you make it out to be. You are partly correct, but you are also partly incorrect. I'll leave it at that.
"A person shall be entitled to a patent [unless] the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention...."
Seriously, I understand it's human nature to not wish to admit an error. But best let this one lie.