Granted Patent
Utility
US 6,557,573 · App. 09/778,518
Liquid fertilizer distribution system and method
Inventor:
Spencer M. Nimberger
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Feb 6, 2001
Inventor
Spencer M. Nimberger
Assignee (at issue)
PGI INTERNATIONAL, LTD.
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.