Granted Patent
Utility
US 4,297,818 · App. 06/134,694
Roof ventilating louver
Inventor:
William J. Anderson
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Mar 27, 1980
Inventor
William J. Anderson
Assignee (at issue)
Anderson Metal Products 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.