N.J. Stat. § 48:5-15: Signing, recording and filing certificate

The certificate of incorporation shall be signed in person by all the incorporators and proved or acknowledged as required for deeds of real estate and recorded in the office of the clerk of the county where the principal office of the company shall be established. After being so recorded a copy thereof to be certified by the clerk shall be filed in the office of the secretary of state. Thereupon the incorporators and their successors shall be a corporation. The secretary of state shall record the certificate in a book to be kept for that purpose.