Granted Patent
Utility
US 4,442,148 · App. 06/307,702
Waterproofing laminate
Inventor:
Robert F. Stierli
Patented Case
View Patent ↗
Granted: Apr 10, 1984
Filed: Oct 2, 1981
Inventor
Robert F. Stierli
Assignee (at issue)
W. R. Grace & Co.
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.