Granted Patent
Utility
US 5,724,701 · App. 08/290,540
H.V.A.C. duct cleaning system
Inventor:
Edward A. Jones
Patented Case
View Patent ↗
Granted: Mar 10, 1998
Filed: Aug 15, 1994
Inventor
Edward A. Jones
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.