64 Pa. Stat. § 5
All and every the quit-rents, which at any time or times heretofore have been reserved in and by any warrant, patent or other conveyance of lands or other hereditaments, from, by or under the said proprietaries, their officers, or others by them commissioned and appointed, and all and every the dues and arrearages of quit-rents, and arrearages of purchase moneys for lands, not within the tenths or manors aforesaid, or which at any time or times heretofore have been deemed or taken to be due and in arrear, other than the quit or other rents reserved within the proprietary tenths or manors before mentioned, shall from henceforth cease and determine; and the same lands and other hereditaments shall be held free and discharged therefrom, and from the payment thereof, forever.
64 P.S. § 5