Me. Rev. Stat. tit. 13, § 747

If the shares of a disqualified person are not acquired pursuant to section 743 within 10 months after the death of the shareholder or within 5 months after the disqualification or transfer, the professional corporation shall immediately cancel the shares on its books and the disqualified person has no further interest as a shareholder in the corporation other than the right to payment for the shares under section 743.