Granted Patent
Utility
US 4,227,916 · App. 06/071,170
Control of weeds with 1-(3-methyl-5-isothiazolyl)-3-alkoxyl-3-methylureas
Inventor:
Dennis K. Krass
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Aug 30, 1979
Inventor
Dennis K. Krass
Assignee (at issue)
PPG Industries, 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.