Granted Patent
Utility
US 4,274,243 · App. 05/970,720
Asphalt shingle for simulating a tiled roof
Inventors:
Raymond L. R. Corbin, Robert F. Reinhart
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Dec 18, 1978
Inventors
Raymond L. R. Corbin
Robert F. Reinhart
Assignee (at issue)
Johns Manville
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.