Granted Patent
Utility
US 6,774,154 · App. 10/118,548
Semiflexible and flexible polyurethanes foams having low fogging characteristics and improved physical properties
Inventor:
Wally Liyuan Chang
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Apr 8, 2002
Inventor
Wally Liyuan Chang
Assignee (at issue)
Crompton Corporation
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.