Granted Patent
Utility
US 4,452,345 · App. 06/286,139
Brake system for railway vehicle
Inventor:
Julien C. Mathieu
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Jul 23, 1981
Inventor
Julien C. Mathieu
Assignee (at issue)
DayCo Holdings, LP
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.