Granted Patent
Utility
US 4,921,961 · App. 07/222,449
2-Carbamoyl-3-quinolinecarboxylic acids and salts as intermediates for the preparation of herbicidal 2-(5-isoproyl-5-methyl-4-oxo-2-imidazolin-2-yl)-3-quinolinecarboxylic acids
Inventor:
Marinus Los
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Jul 18, 1988
Inventor
Marinus Los
Assignee (at issue)
American Cyanamid 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.