Granted Patent
Utility
US 6,797,041 · App. 10/090,040
Two stage air filter
Inventors:
Kyle Andrew Brownell, Scott W. Mathews, Alan Lorenz Breitenfeldt, Emery W. Neltzel
Patented Case
View Patent ↗
Granted: Sep 28, 2004
Filed: Mar 1, 2002
Inventors
Kyle Andrew Brownell
Scott W. Mathews
Alan Lorenz Breitenfeldt
Emery W. Neltzel
Assignee (at issue)
Greenheck Fan Corporation
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.