Granted Patent
Utility
US 6,041,824 · App. 08/960,807
Clean air ducts and methods for the manufacture thereof
Inventor:
James A. Powell
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Oct 30, 1997
Inventor
James A. Powell
Assignee (at issue)
STEERE ENTERPRISES, INC.
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.