Granted Patent
Utility
US 4,641,892 · App. 06/680,769
Railway emergency brake system
Inventor:
Hartmut Schmid
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Dec 12, 1984
Inventor
Hartmut Schmid
Assignee (at issue)
DSL Dynamic Sciences Limited
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.