At the expiration of six months after the time of filing of such patent, or a certified copy thereof in the office of the county auditor, if there has been no adverse claim filed in the meantime, the council must execute and deliver to such claimant, his or her, its or their heirs, executors, administrators, grantees, successors or assigns a good and sufficient deed of the premises described in the application of the claimant originally filed, if proper proof shall have been made, which said deed must be signed and acknowledged by the mayor or other presiding officer of the council, and attested by the corporate seal of such city or town. No conveyance of any such lands made as in this chapter provided, concludes the rights of third persons; but such third persons may have their action in the premises, to determine their alleged interest in such lands and their right to the legal title thereto against such grantee, his, her, its or their heirs, successors or assigns, to which they may deem themselves entitled either in law or equity; but no action for the recovery or possession of such premises, or any portion thereof, or to establish the right to the legal title thereto, must be maintained in any court against the grantee named therein, or against his, her, its or their legal representatives or assigns, unless such action shall be commenced within six months after such deed shall have been filed for record in the office of the county auditor of the county where such lands are situate; nothing herein shall be construed to extend the time of limitation prescribed by law for the commencement of actions upon the possessory claim or title to real estate, when such action is barred by law at the time of the passage of this chapter.