Granted Patent
Utility
US 4,314,234 · App. 06/103,885
Test set for railway cab signal system
Inventors:
John O. G. Darrow, Joseph J. Pierro, Jr.
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Dec 17, 1979
Inventors
John O. G. Darrow
Joseph J. Pierro, Jr.
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.