Granted Patent
Utility
US 5,990,232 · App. 08/918,207
Stabilizers for polymer polyols
Inventors:
Jianzhong Shen, Kenneth G. McDaniel, John E. Hayes, Uli B. Holeschovsky, Harry R. Hinney
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Aug 25, 1997
Inventors
Jianzhong Shen
Kenneth G. McDaniel
John E. Hayes
Uli B. Holeschovsky
Harry R. Hinney
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.