Granted Patent
Utility
US 5,826,388 · App. 08/786,666
Composite insulating drainage wall system
Inventor:
Michael R. Irving
Patented Case
View Patent ↗
Granted: Oct 27, 1998
Filed: Jan 21, 1997
Inventor
Michael R. Irving
Assignee (at issue)
K-2 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.