Granted Patent
Utility
US 6,792,874 · App. 10/446,265
Railroad car center plate assembly conductive liner
Inventors:
John D. Anderson, W. Matthew Tonn
Patented Case
View Patent ↗
Granted: Sep 21, 2004
Filed: May 23, 2003
Inventors
John D. Anderson
W. Matthew Tonn
Assignee (at issue)
ZefTek, 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.