Granted Patent
Utility
US 4,117,639 · App. 05/811,300
Reinforced insulated concrete building panel
Inventors:
Thomas W. Steenson, W. Donald Paton
Patented Case
View Patent ↗
Granted: Oct 3, 1978
Filed: Jun 29, 1977
Inventors
Thomas W. Steenson
W. Donald Paton
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.