Granted Patent
Utility
US 4,490,511 · App. 06/584,429
Process for preparation of low-dusting epoxy curing agents based on trimellitic anhydride
Inventors:
Simon M. Li, Fred R. Lemley
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Feb 28, 1984
Inventors
Simon M. Li
Fred R. Lemley
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.