Granted Patent
Utility
US 4,134,394 · App. 05/771,640
Air ventilation system
Inventor:
James T. Otenbaker
Patented Case
View Patent ↗
Granted: Jan 16, 1979
Filed: Feb 24, 1977
Inventor
James T. Otenbaker
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.