Granted Patent
Utility
US 4,233,353 · App. 06/039,575
High-strength built-up roofing using improved glass fiber mats
Inventors:
Alfredo A. Bondoc, V. Robert Canfield, B. Randall Ziegler
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: May 16, 1979
Inventors
Alfredo A. Bondoc
V. Robert Canfield
B. Randall Ziegler
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.