Granted Patent
Utility
US 4,763,267 · App. 06/876,022
System for indicating track sections in an interlocking area as occupied or unoccupied
Inventors:
Alan C. Knight, Helmut Uebel
Patented Case
View Patent ↗
Granted: Aug 9, 1988
Filed: Jun 19, 1986
Inventors
Alan C. Knight
Helmut Uebel
Assignee (at issue)
Alcatel N.V.
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.