§ 1069.
In all inter partes proceedings equitable principles of laches, estoppel, and acquiescence, where applicable may be considered and applied.
([July 5, 1946, ch. 540], title I, § 19, [60 Stat. 434]; [Pub. L. 93–596, § 1], Jan. 2, 1975, [88 Stat. 1949];