N.D. Cent. Code § 50-06.3-12: Interest not to accrue on uncollected claims

Rights existing and vested or instruments executed under sections 50-24-13, 50-24-15, 50-24-30, 50-24-33, 50-24-34, and 50-24-38 prior to July 1, 1979, continue to be effective until their expiration according to their own terms or by force of law. Interest not already collected may not accrue on the principal amount of those claims.