Granted Patent
Utility
US 5,962,728 · App. 08/961,800
Isocyanate residue purification
Inventors:
Robert W. Mason, Farhad Fadakar, Joseph P. Bridges, Larry K. Butler, Majid Keyvani
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Oct 31, 1997
Inventors
Robert W. Mason
Farhad Fadakar
Joseph P. Bridges
Larry K. Butler
Majid Keyvani
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.