Granted Patent
Utility
US 6,066,211 · App. 09/197,401
Battery-powered electric vacuum cleaner system
Inventor:
Michael W. Sandell
Patented Case
View Patent ↗
Granted: May 23, 2000
Filed: Nov 20, 1998
Inventor
Michael W. Sandell
Assignee (at issue)
The ServiceMaster Company
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.