Granted Patent
Utility
US 6,463,337 · App. 09/467,796
Railroad vital signal output module with cryptographic safe drive
Inventor:
Jim Walker
Patented Case
View Patent ↗
Granted: Oct 8, 2002
Filed: Dec 20, 1999
Inventor
Jim Walker
Assignee (at issue)
Safetran Systems Corporation
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.