37 CFR § 42.1 - Policy.
(a) Scope. Part 42 governs proceedings before the Patent Trial and Appeal Board. Sections 1.4, 1.7, 1.14, 1.16, 1.22, 1.23, 1.25, 1.26, 1.32, 1.34, and 1.36 of this chapter also apply to proceedings before the Board, as do other sections of part 1 of this chapter that are incorporated by reference into this part.
(b) Construction. This part shall be construed to secure the just, speedy, and inexpensive resolution of every proceeding.
(d) Evidentiary standard. The default evidentiary standard is a preponderance of the evidence.
The following state regulations pages link to this page.