Granted Patent
Utility
US 6,468,666 · App. 09/444,499
Magnetic susceptible markerboard
Inventors:
Robert R. Krebs, Ernest L. Phelps
Patented Case
View Patent ↗
Granted: Oct 22, 2002
Filed: Nov 22, 1999
Inventors
Robert R. Krebs
Ernest L. Phelps
Assignee (at issue)
Premark RWP Holdings, 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.