Granted Patent
Utility
US 5,630,246 · App. 08/454,436
Floor cleaning apparatus with flap having wear indicator
Inventors:
Christopher M. Knowlton, Robert J. O'Hara, Timothy A. Strickland
Patented Case
View Patent ↗
Granted: May 20, 1997
Filed: May 30, 1995
Inventors
Christopher M. Knowlton
Robert J. O'Hara
Timothy A. Strickland
Assignee (at issue)
Windsor Industries, Inc.
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.