Granted Patent
Utility
US 6,784,392 · App. 10/070,749
Gas-insulated switchgear device
Inventors:
Costante Piazza, Libero Sfondrini, Aldo Sciacca
Patented Case
View Patent ↗
Granted: Aug 31, 2004
Filed: Mar 11, 2002
Inventors
Costante Piazza
Libero Sfondrini
Aldo Sciacca
Assignee (at issue)
ABB Service S.R.L
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.