Granted Patent
Utility
US 5,856,639 · App. 08/520,116
Pointer position detection system using a signal processor in the pointer
Inventor:
Waldo L. Landmeier
Patented Case
View Patent ↗
Granted: Jan 5, 1999
Filed: Aug 28, 1995
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.