Granted Patent
Utility
US 5,893,248 · App. 08/888,921
Insulating panel and method for building and insulating a ceiling structure
Inventor:
Jean-Louis Beliveau
Patented Case
View Patent ↗
Granted: Apr 13, 1999
Filed: Jul 7, 1997
Inventor
Jean-Louis Beliveau
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.