Granted Patent
Utility
US 4,641,471 · App. 05/882,859
Fastener for securing roofing material to cementitious roof decks
Inventors:
Kenneth E. Young, Hubert T. Dudley, Robert T. Frohlich
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Mar 2, 1978
Inventors
Kenneth E. Young
Hubert T. Dudley
Robert T. Frohlich
Assignee (at issue)
W. R. Grace & Co.
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.