Granted Patent
Utility
US 4,299,780 · App. 06/133,790
Process for preparing salts of carbamoyl sulfonic acid derivatives
Inventor:
Young Jin Lee
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Mar 25, 1980
Inventor
Young Jin Lee
Assignee (at issue)
Union Carbide Corporation
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.