Granted Patent
Utility
US 4,949,570 · App. 07/288,473
Method and apparatus for calibrating agricultural granular material applicators
Inventors:
David M. Harmon, Winston H. Hines
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Dec 22, 1988
Inventors
David M. Harmon
Winston H. Hines
Assignee (at issue)
American Cyanamid Company
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.