Granted Patent
Utility
US 4,892,533 · App. 07/228,634
Ultrahigh water-absorbing fiber-forming composition
Inventor:
Bi Le-Khac
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Aug 4, 1988
Inventor
Bi Le-Khac
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.