1.491    National stage commencement, entry, and fulfillment.

[Editor Note: Certain paragraphs below are applicable only to patent applications filed under 35 U.S.C. 111(a)  or 363  on or after September 16, 2012*] [Added, 52 FR 20050, May 28, 1987; revised, 66 FR 45775, Aug. 30, 2001; revised, 67 FR 520, Jan. 4, 2002, effective Apr. 1, 2002; heading and para. (b) revised and para. (c) added, 77 FR 48776, Aug. 14, 2012, effective Sept. 16, 2012] [*The changes effective Sept. 16, 2012 are applicable only to patent applications filed under 35 U.S.C. 111(a)  or 363  on or after Sept. 16, 2012. See § 1.491 (pre‑AIA)  for the rule otherwise in effect.]