Granted Patent
Utility
US 5,389,166 · App. 07/990,989
Water barrier formed from a clay-fiber mat
Inventor:
Alec W. White
Patented Case
View Patent ↗
Granted: Feb 14, 1995
Filed: Dec 16, 1992
Inventor
Alec W. White
Assignee (at issue)
American Colloid Company
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.