Granted Patent
Utility
US 4,804,811 · App. 07/034,782
Multi-operator grid system for stud welding
Inventors:
Robert J. Raycher, Ronald A. Cangro, Charles E. Gum, Dean P. Macinskas, Francis J. Williams
Patented Case
View Patent ↗
Granted: Feb 14, 1989
Filed: Apr 3, 1987
Inventors
Robert J. Raycher
Ronald A. Cangro
Charles E. Gum
Dean P. Macinskas
Francis J. Williams
Assignee (at issue)
Erico Fastening Systems, 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.