Granted Patent
Utility
US 5,671,679 · App. 08/642,244
Fully automatic, multiple operation rail maintenance apparatus
Inventors:
William D. Straub, Bruce M. Boczkiewicz, David Johnsen
Patented Case
View Patent ↗
Granted: Sep 30, 1997
Filed: Apr 24, 1996
Inventors
William D. Straub
Bruce M. Boczkiewicz
David Johnsen
Assignee (at issue)
Nordco 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.