Granted Patent
Utility
US 4,562,241 · App. 06/657,869
Diurethane diureas and the use thereof
Inventor:
Alfred Renner
Patented Case
View Patent ↗
Granted: Dec 31, 1985
Filed: Oct 4, 1984
Inventor
Alfred Renner
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.