Since the US adopted a first-to-file-or-disclose system, the need to prove prior invention has diminished, but there is still a need to keep invention records. In particular, the inventor should still document: (a) invention activity (to be able to prove that the invention was not derived from another inventor); (b) pre-filing disclosures to third parties (to be able to prove that any disclosure from a third party was derived from the inventor); and (c) prefiling public disclosures (to antedate a third party patent application or disclosure within a year).