Granted Patent
Utility
US 4,540,428 · App. 06/475,980
Phosphorotriamidate urease inhibitors and urease inhibited urea based fertilizer compositions
Inventors:
Michael Van Der Puy, Larry L. Hendrickson, Jaroslav F. Kolc, Milorad M. Rogic, Michael D. Swerdloff
Patented Case
View Patent ↗
Granted: Sep 10, 1985
Filed: Mar 16, 1983
Inventors
Michael Van Der Puy
Larry L. Hendrickson
Jaroslav F. Kolc
Milorad M. Rogic
Michael D. Swerdloff
Assignee (at issue)
ALLIED CONSULTING, 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.