Granted Patent
Utility
US 4,147,003 · App. 05/832,656
Insulated roof
Inventor:
Robert J. Alderman
Patented Case
View Patent ↗
Granted: Apr 3, 1979
Filed: Sep 12, 1977
Inventor
Robert J. Alderman
Assignee (at issue)
BUTLER MANUFACTURING COMPANY
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.