Granted Patent
Utility
US 5,012,413 · App. 07/225,040
Railroad track curve lining apparatus and method
Inventors:
Dennis A. Sroka, William E. Perry
Patented Case
View Patent ↗
Granted: Apr 30, 1991
Filed: Jul 27, 1988
Inventors
Dennis A. Sroka
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.