Granted Patent
Utility
US 4,117,395 · App. 05/795,172
Digital stroboscope-tachometer
Inventor:
Robert H. Redfield
Patented Case
View Patent ↗
Granted: Sep 26, 1978
Filed: May 9, 1977
Inventor
Robert H. Redfield
Assignee (at issue)
Power Instruments, 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.