Granted Patent
Utility
US 5,216,220 · App. 07/671,848
Welding of coated metals
Inventors:
Michael Davis, John M. Dowden, Phiroze D. Kapadia, Kenneth R. Rickwood
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Apr 12, 1991
Inventors
Michael Davis
John M. Dowden
Phiroze D. Kapadia
Kenneth R. Rickwood
Assignee (at issue)
British Technology Group Limited
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.