Granted Patent
Utility
US 4,871,871 · App. 07/266,607
Process for the preparation of aromatic mono- and polyisocyanates
Inventors:
Edward T. Shawl, Haven S. Kesling, Jr.
Patented Case
View Patent ↗
Granted: Oct 3, 1989
Filed: Nov 3, 1988
Inventors
Edward T. Shawl
Haven S. Kesling, Jr.
Assignee (at issue)
Arco Chemical Technology, L.P.
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.