Granted Patent
Utility
US 5,725,630 · App. 08/690,507
Dry granular fertilizer blend and a method of fertilizing plants
Inventors:
Johnnie R. Roberts, Greg Volgas
Patented Case
View Patent ↗
Granted: Mar 10, 1998
Filed: Jul 31, 1996
Inventors
Johnnie R. Roberts
Greg Volgas
Assignee (at issue)
HELENA CHEMICAL CORP.
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.