Granted Patent
Utility
US 6,260,232 · App. 09/397,464
Surface cleaning apparatus
Inventors:
Marc O. Nelson, Earl E. Martens
Patented Case
View Patent ↗
Granted: Jul 17, 2001
Filed: Sep 16, 1999
Inventors
Marc O. Nelson
Earl E. Martens
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.