Granted Patent
Utility
US 4,344,722 · App. 06/226,409
Waterproofing barrier
Inventor:
Jules M. Blais
Patented Case
View Patent ↗
Granted: Aug 17, 1982
Filed: Jan 19, 1981
Inventor
Jules M. Blais
Assignee (at issue)
Bemalux Inc.
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.