Earlier quoted context omitted.
Prior art has to be well known? Please tell me what court said that.
I have in mind a case noted by the ipwatchdog site, I believe. The following isn't the case I had in mind, which was more extreme still, and much more recent, but here's a start: A reference “is ‘publicly accessible’ upon a satisfactory showing that [the reference] has been disseminated or otherwise made available to the extent that persons interested and ordinarily skilled in the subject matter or art exercising rea…
How well known something must be is obviously going to be subject to interpretation. If you tell your co-worker at the bar, that’s probably not sufficient. If you publish on your blog that no one knows about, that’s probably also not sufficient. If you publish in a journal, that probably is more than sufficient. If you cannot reasonably claim that the other inventor should have been able to find your prior art, then the courts will rule against you.