Granted Patent
Utility
US 5,768,128 · App. 08/529,406
System for determining fertilizer blend and application rate method and apparatus for determining optimum fertilizer blends, based on a plurality of factors, to match field nutrient requirements
Inventors:
Wayne Thompson, Donald E. McGrath
Patented Case
View Patent ↗
Granted: Jun 16, 1998
Filed: Sep 18, 1995
Inventors
Wayne Thompson
Donald E. McGrath
Assignee (at issue)
Iboco, Inc.
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.