Okla. Stat. tit. 76, § 109

EFFECTIVE DATE. The Innocent Successor Asbestos-Related Liability Fairness Act shall apply to all asbestos claims filed against an innocent successor on or after the effective date of the Innocent Successor Asbestos-Related Liability Fairness Act. The Innocent Successor Asbestos-Related Liability Fairness Act shall also apply to any pending asbestos claims against an innocent successor in which trial has not commenced as of the effective date of the Innocent Successor Asbestos-Related Liability Fairness Act, except that any provisions of these sections which would be unconstitutional if applied retroactively shall be applied prospectively.