Granted Patent
Utility
US 6,578,799 · App. 10/006,506
Modular point detector for railroad track signal
Inventor:
Daniel Brushwood
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: Dec 6, 2001
Inventor
Daniel Brushwood
Assignee (at issue)
Union Switch & Signal, 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.