Granted Patent
Utility
US 4,391,075 · App. 06/202,989
Insulated roof structure
Inventor:
Dwight Musgrave
Patented Case
View Patent ↗
Granted: Jul 5, 1983
Filed: Nov 3, 1980
Inventor
Dwight Musgrave
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.