Granted Patent
Utility
US 4,287,766 · App. 06/078,958
Inspection of solder joints by acoustic impedance
Inventor:
Dale Ensminger
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Sep 26, 1979
Inventor
Dale Ensminger
Assignee (at issue)
Battelle Development Corporation
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.