Granted Patent
Utility
US 4,636,612 · App. 06/597,460
Optical tracking device
Inventor:
Richard A. Cullen
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: Apr 6, 1984
Inventor
Richard A. Cullen
Assignee (at issue)
Cyclomatic Industries, 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.