Granted Patent
Utility
US 5,252,817 · App. 07/674,850
Detector system for detecting the occurrence of welding using detector feedback
Inventors:
John D. Fergason, Jeffrey K. Fergason
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Mar 25, 1991
Inventors
John D. Fergason
Jeffrey K. Fergason
Assignee (at issue)
OSD Envizion, 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.