Granted Patent
Utility
US 5,064,913 · App. 07/658,621
Glycidylester-anhydride adducts and epoxy resin curing agents therefrom
Inventors:
Petrus G. Kooijmans, Johannes M. Van Der Mark, Willem Karzijn
Patented Case
View Patent ↗
Granted: Nov 12, 1991
Filed: Feb 21, 1991
Inventors
Petrus G. Kooijmans
Johannes M. Van Der Mark
Willem Karzijn
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.