Granted Patent
Utility
US 5,237,945 · App. 07/677,005
Water barrier formed from a clay-fiber mat
Inventor:
Alec W. White
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Apr 2, 1991
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.