No written satisfaction or intended satisfaction given prior to the date hereof with respect to any mortgage on real property, situate in this Commonwealth, shall be deemed, held or adjudged invalid, defective or insufficient in law if the same shall purport to satisfy or discharge the lien of any mortgage and shall have been duly executed and acknowledged by or on behalf of the mortgagee and recorded in the office of the recorder of deeds of the county of the Commonwealth wherein the real property described or referred to in such satisfaction is situate, but all such satisfactions shall be good, valid and effective in law for the purposes therein recited.