Patent September 4th 1788
This patent is the third patent issued by the U.S. government. Note: Fourth line down, "for carrying into effect a contract between the United States and the State of Pennsylvania". All land patents are contracts between the original owner, his heirs and assigns and the United States, forever. Go to the U.S. constitution; Article one, Section 10 (No State shall pass laws impairing the Obligations of Contracts) There are no covenants on this patent. It was signed by President George Washington.
http://www.landrights.com/patents.htm