Granted Patent
Utility
US 5,434,370 · App. 08/148,837
Marking system with pen-up/pen-down tracking
Inventors:
Scott Wilson, Samuel W. Mallicoat, Donald H. Zurstadt
Patented Case
View Patent ↗
Granted: Jul 18, 1995
Filed: Nov 5, 1993
Inventors
Scott Wilson
Samuel W. Mallicoat
Donald H. Zurstadt
Assignee (at issue)
Microfield Graphics, 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.