Granted Patent
Utility
US 6,755,135 · App. 10/233,922
Combined tie extractor and plate remover for rail maintenance
Inventors:
David Johnsen, William D. Straub, Bruce M. Boczkiewicz
Patented Case
View Patent ↗
Granted: Jun 29, 2004
Filed: Sep 3, 2002
Inventors
David Johnsen
William D. Straub
Bruce M. Boczkiewicz
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.