Granted Patent
Utility
US 5,970,575 · App. 08/720,502
Dust-collecting unit for a combination-type vacuum cleaner
Inventor:
Nam-Ho Lee
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Sep 30, 1996
Inventor
Nam-Ho Lee
Assignee (at issue)
Daewoo Electronics 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.