California Code, Corporations Code - CORP § 16912

(a) Unless a future effective date or time is provided in a certificate of merger if a certificate of merger is required to be filed under Section 16915 in which event the merger shall be effective at the future effective date or time:

(b) For all mergers in which a certificate of merger is required to be filed under Section 16915, a copy of the certificate of merger duly certified by the Secretary of State is conclusive evidence of the merger of (A) the constituent partnerships (either by themselves or together with constituent other business entities) into the surviving other business entity, or (B) the constituent partnerships or the constituent other business entities, or both, into the surviving partnership.