Granted Patent
Utility
US 4,726,587 · App. 06/884,771
Optical bowling pin sensor
Inventor:
Robert C. Fitch
Patented Case
View Patent ↗
Granted: Feb 23, 1988
Filed: Jul 11, 1986
Inventor
Robert C. Fitch
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.