Granted Patent
Utility
US 5,965,878 · App. 08/965,012
Performing quadrature and push button function utilizing two IR emitter/detector pairs
Inventor:
Bradley J. Vircks
Patented Case
View Patent ↗
Granted: Oct 12, 1999
Filed: Nov 5, 1997
Inventor
Bradley J. Vircks
Assignee (at issue)
Rockwell Science Center, LLC
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.