Granted Patent
Utility
US 4,567,079 · App. 06/656,213
High-strength built-up roofing using improved ply sheets
Inventors:
V. Robert Canfield, William J. Woodring, Mira C. Kubiak
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: Oct 1, 1984
Inventors
V. Robert Canfield
William J. Woodring
Mira C. Kubiak
Assignee (at issue)
GAF Corporation
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.