Granted Patent
Utility
US 4,410,014 · App. 06/362,709
Flexible insulated air duct
Inventor:
Clifford Smith
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Mar 29, 1982
Inventor
Clifford Smith
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.