Granted Patent
Utility
US 4,997,701 · App. 07/274,166
Seawater resistant clay mixture
Inventor:
Arthur J. Clem
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Nov 21, 1988
Inventor
Arthur J. Clem
Assignee (at issue)
James Clem 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.