Granted Patent
Utility
US 4,528,356 · App. 06/634,831
Process for preparing higher molecular weight epoxy resins
Inventor:
Roy A. Allen
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Jul 26, 1984
Inventor
Roy A. Allen
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.