Granted Patent
Utility
US 4,817,358 · App. 06/514,433
Asphalt shingle with foamed asphalt layer under tabs
Inventors:
William W. Lincoln, Stephen J. Jones
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Jul 18, 1983
Inventors
William W. Lincoln
Stephen J. Jones
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.