Granted Patent
Utility
US 4,047,345 · App. 05/638,329
Roof system
Inventor:
Robert J. Alderman
Patented Case
View Patent ↗
Granted: Sep 13, 1977
Filed: Dec 8, 1975
Inventor
Robert J. Alderman
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.