Granted Patent
Utility
US 6,779,227 · App. 10/066,537
Multiple functional vacuum cleaner
Inventor:
Wen-Sung Lee
Patented Case
View Patent ↗
Granted: Aug 24, 2004
Filed: Feb 4, 2002
Inventor
Wen-Sung Lee
Assignee (at issue)
Leh Chu Enterprise Co., Ltd.
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.