64 Pa. Stat. § 111
No warrant shall issue after the fifteenth day of June, for any land within that part of this commonwealth, commonly called the new purchase, and the triangular tract upon Lake Erie, except in favor of persons claiming the same by virtue of some settlement and improvement being made thereon; and that all applications for lands that may remain on the files of the land office, after the said fifteenth day of June next, and for which the purchase money shall not have been paid on that day, shall be null and void: Provided however, That applications may be received, and warrants may issue, until the first day of January, 1795, in favor of any person or persons to whom any balance or balances may be due in the land office, on unsatisfied warrants issued before the twenty-ninth day of March, 1792, for such quantity of land respectively as may be sufficient to discharge such balance or balances: Provided always, That nothing in this act shall be so construed, as that warrants, except those wherein the land is particularly described, shall in any manner affect the title of the claim of any person having made an actual improvement before such warrant is entered and surveyed in the deputy surveyor's books.
64 P.S. § 111