Granted Patent
Utility
US 6,273,125 · App. 09/704,035
Compression key lockout device for a gate valve
Inventors:
Robert A. Blenkush, Keith V. Warzecka
Patented Case
View Patent ↗
Granted: Aug 14, 2001
Filed: Nov 1, 2000
Inventors
Robert A. Blenkush
Keith V. Warzecka
Assignee (at issue)
SPX Corporation
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.