64 Pa. Stat. § 152
In all cases where an actual settler has, adverse to the original warrantee, taken possession of a tract of land surveyed on an original warrant, and has made such actual settlement, residence and improvements as are described in the said ninth section of said act, and an agreement or compromise shall take place at any time after the passing of this act, and before the first day of June, 1813, between such actual settler or his legal representative, and the original warrantee or his legal representative, either by the warrantee or his legal representative releasing his claim to one hundred and fifty acres with the usual allowance of said tract, to be surveyed and laid off by the proper deputy surveyor, to said settler or his legal representative, including said settler's improvements, clear of expense or consideration, excepting the consideration of said settlement, or in cases where either party shall, between the dates aforesaid, purchase the right or claim of the other to said tract of land, that in such case the commonwealth shall cease to have any further claim to said tract, and the title to the same shall be confirmed to such warrantee and settler, or their legal representatives, accordingly.
64 P.S. § 152