Granted Patent
Utility
US 4,825,616 · App. 07/184,528
Roofing shingle
Inventors:
Alfredo A. Bondoc, Stanley P. Frankoski, Frederick W. Sieling
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Apr 21, 1988
Inventors
Alfredo A. Bondoc
Stanley P. Frankoski
Frederick W. Sieling
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.