Granted Patent
Utility
US 4,333,291 · App. 06/172,876
Insulated roof structure
Inventors:
Dwight Musgrave, John McMahan, Robert L. Downing, III
Patented Case
View Patent ↗
Granted: Jun 8, 1982
Filed: Jul 28, 1980
Inventors
Dwight Musgrave
John McMahan
Robert L. Downing, III
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.