Granted Patent
Utility
US 4,873,364 · App. 07/283,430
Process for the preparation of methylene diphenylene diisocyanates and polymethylene polyphenylene poly (diisocyanates)
Inventors:
Edward T. Shawl, Haven S. Kesling, Jr.
Patented Case
View Patent ↗
Granted: Oct 10, 1989
Filed: Dec 9, 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.