Granted Patent
Utility
US 5,617,639 · App. 08/311,361
Railroad maintenance vehicle reference system transducer
Inventor:
William E. Perry
Patented Case
View Patent ↗
Granted: Apr 8, 1997
Filed: Sep 23, 1994
Inventor
William E. Perry
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.