Granted Patent
Utility
US 6,491,579 · App. 09/565,983
Roof ventilation system and method
Inventor:
Harry T. O'Hagin
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: May 4, 2000
Inventor
Harry T. O'Hagin
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.