Granted Patent
Utility
US 4,994,100 · App. 07/292,004
Homogeneous granular nitrogen fertilizer
Inventors:
Allen R. Sutton, Charles W. Weston, Richard L. Balser
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Dec 29, 1988
Inventors
Allen R. Sutton
Charles W. Weston
Richard L. Balser
Assignee (at issue)
Freeport-McMoRan Resource Partners, Limited Partnership
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.