Granted Patent
Utility
US 4,831,216 · App. 07/156,358
Digitizer system with intertwined loopback conductor grid
Inventor:
Waldo L. Landmeier
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Feb 12, 1988
Inventor
Waldo L. Landmeier
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.