Granted Patent
Utility
US 5,186,732 · App. 07/791,037
Encapsulated slow release fertilizers
Inventors:
Harold E. Thompson, Richard A. Kelch
Patented Case
View Patent ↗
Granted: Feb 16, 1993
Filed: Nov 12, 1991
Inventors
Harold E. Thompson
Richard A. Kelch
Assignee (at issue)
The O. M. Scott and Sons 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.