Granted Patent
Utility
US 5,160,813 · App. 07/767,112
Cordless digitizer local conductor phase reference system
Inventor:
James S. Watson
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Sep 27, 1991
Inventor
James S. Watson
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.