Granted Patent
Utility
US 4,380,188 · App. 06/229,300
Heat-retarding air distribution unit
Inventor:
Richard NICHOLS
Patented Case
View Patent ↗
Granted: Apr 19, 1983
Filed: Jan 28, 1981
Inventor
Richard NICHOLS
Assignee (at issue)
Barber-Coleman Company
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.