Granted Patent
Utility
US 5,564,864 · App. 08/207,008
Clay liner for steep slopes
Inventors:
William J. Simpson, Martin Simpson
Patented Case
View Patent ↗
Granted: Oct 15, 1996
Filed: Mar 7, 1994
Inventors
William J. Simpson
Martin Simpson
Assignee (at issue)
Claymax 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.