Granted Patent
Utility
US 5,691,440 · App. 08/539,572
Catalyst and process for producing isocyanate trimers
Inventors:
Lawrence E. Katz, Edward A. Barsa, Benjamin W. Tucker, Paul V. Grosso
Patented Case
View Patent ↗
Granted: Nov 25, 1997
Filed: Oct 5, 1995
Inventors
Lawrence E. Katz
Edward A. Barsa
Benjamin W. Tucker
Paul V. Grosso
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.