Granted Patent
Utility
US 6,573,469 · App. 09/807,422
Gas-insulated switchgear device
Inventor:
Costante Piazza
Patented Case
View Patent ↗
Granted: Jun 3, 2003
Filed: May 8, 2000
Inventor
Costante Piazza
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.