Granted Patent
Utility
US 5,452,870 · App. 08/259,892
Fixed data transmission system for controlling train movement
Inventor:
Robert E. Heggestad
Patented Case
View Patent ↗
Granted: Sep 26, 1995
Filed: Jun 16, 1994
Inventor
Robert E. Heggestad
Assignee (at issue)
Harmon Industries, LLC
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.