Granted Patent
Utility
US 4,672,174 · App. 06/843,899
Monitoring stud-welding-phototransistor responds to arc light
Inventor:
Yoshiteru Kondo
Patented Case
View Patent ↗
Granted: Jun 9, 1987
Filed: Mar 25, 1986
Inventor
Yoshiteru Kondo
Assignee (at issue)
USM Holding AG
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.