Granted Patent
Utility
US 6,311,355 · App. 09/655,279
Sweeper
Inventor:
Mauno Ruuska
Patented Case
View Patent ↗
Granted: Nov 6, 2001
Filed: Sep 5, 2000
Inventor
Mauno Ruuska
Assignee (at issue)
Pairia Vammas Oy
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.