Granted Patent
Utility
US 4,769,402 · App. 07/048,208
Aqueous solutions of resinous compounds
Inventors:
Willem Karzijn, Petrus G. Kooijmans
Patented Case
View Patent ↗
Granted: Sep 6, 1988
Filed: May 11, 1987
Inventors
Willem Karzijn
Petrus G. Kooijmans
Assignee (at issue)
SHELL OIL 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.