Granted Patent
Utility
US 6,176,247 · App. 09/172,678
Method and device for verifying the workability of a safety device
Inventors:
John Winchcomb, Karl-Kristian Hogstrom
Patented Case
View Patent ↗
Granted: Jan 23, 2001
Filed: Oct 15, 1998
Inventors
John Winchcomb
Karl-Kristian Hogstrom
Assignee (at issue)
Neles Field Controls OY
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.