Granted Patent
Utility
US 6,813,848 · App. 10/398,406
Method for ploughing snow and a snow plough
Inventor:
Tapio Heikki Ortamala
Patented Case
View Patent ↗
Granted: Nov 9, 2004
Filed: Jul 21, 2003
Inventor
Tapio Heikki Ortamala
Assignee (at issue)
Patria 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.