Oregon Revised Statutes Corporations and Partnerships § 60.444

If a corporation has not yet issued shares, its incorporators or the board of directors may adopt one or more amendments to the corporation's articles of incorporation. If any such amendment relates to the duration, purposes, authorized capital, rights or preferences of shares or internal affairs, the incorporators or board of directors shall immediately notify in writing each person who is a party to any agreement for the subscription of stock of the corporation. Such notice shall set forth the text of the amendment and state that the subscriber may, within 30 days after delivery or mailing of the notice of amendment, rescind the subscription by notice in writing delivered or mailed to the incorporators or board of directors at an address specified. If a notice of rescission is not delivered or mailed within 30 days, the subscriber may not thereafter assert the fact of the amendment as the basis for avoiding the subscription agreement or asserting any claim against any person.