Granted Patent
Utility
US 4,802,909 · App. 07/107,437
Ureas and their use as herbicides
Inventors:
Hermann Rempfler, Erich Stamm, Rudolph C. Thummel
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Oct 9, 1987
Inventors
Hermann Rempfler
Erich Stamm
Rudolph C. Thummel
Assignee (at issue)
Ciba-Geigy
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.