Granted Patent
Utility
US 4,407,470 · App. 06/295,197
Code reset apparatus for railroad track circuits
Inventor:
Heinz Gilcher
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Aug 21, 1981
Inventor
Heinz Gilcher
Assignee (at issue)
American Standard 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.