Granted Patent
Utility
US 4,740,236 · App. 06/554,734
N-sulfonyl-imino-thiocarbonic acid diesters as herbicide antagonists for the protection of rice crops
Inventor:
Werner Topfl
Patented Case
View Patent ↗
Granted: Apr 26, 1988
Filed: Nov 23, 1983
Inventor
Werner Topfl
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.