64 Pa. Stat. § 146
So much of the act to which this is a supplement, as requires an improvement, settlement and residence to be made, on any tract of land sold under and by virtue of the said, act, in order to the confirmation and completion of the title thereto, be and the same is hereby repealed; and if any tract of land requiring the performance of such conditions to the perfecting of its title, has been or shall be fully paid for, duly surveyed and returned, a patent, if not already granted, may and shall be granted to the owner thereof, upon the payment of the usual fees of office, and the title to every such tract of land shall be as valid, as if the improvement, residence and settlement, required by the said act, had been made: Provided nevertheless, That nothing in this act shall be construed to impair or affect any right or title that may have been acquired by residence, settlement and improvement, agreeably to and under the provisions of the said act, or otherwise, nor to give any advantage to either party, in any suit now pending, or that may be hereafter brought; but every such right and title shall be as valid and effectual, as if this act had not been passed: And provided further, That no patent, granted to a warrantee in pursuance of this act, shall be given in evidence against any actual settler, or person claiming under him, in any cause where the title to said land shall come in question.
64 P.S. § 146