Granted Patent
Utility
US 6,334,396 · App. 09/366,040
Switch stoneblower
Inventors:
William E. Perry, Kevin A. Hansen
Patented Case
View Patent ↗
Granted: Jan 1, 2002
Filed: Aug 2, 1999
Inventors
William E. Perry
Kevin A. Hansen
Assignee (at issue)
Pandrol Jackson, Inc.
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.