Granted Patent
Utility
US 4,754,288 · App. 07/086,917
Pen carousel, pen sensing and indexing
Inventor:
James Lawrence
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Aug 19, 1987
Inventor
James Lawrence
Assignee (at issue)
CalComp 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.