ORS § 105.610
Whenever any person claims real property as a donee of the United States by virtue of a settlement thereon under the Act of Congress approved September 27, 1850, commonly called the Donation Law, or the Acts amendatory thereto, and the patent for such property, or any portion thereof, was wrongfully issued to another, the person may maintain a suit in equity against the person to whom the patent was issued, or those claiming under the person, for the purpose of having the patent canceled, and the estate or interest of the plaintiff in the property ascertained and established. In such suit, the party entitled to and making the settlement under such Acts of Congress, and complying with the subsequent conditions thereby required, is deemed to have a legal estate in fee in the property although the patent therefor was issued to another.
ORS 105.610