Granted Patent
Utility
US 6,568,641 · App. 10/156,927
Electrically operated railroad switch machine
Inventors:
Ray Hoyer, Stephen R. Kuhn
Patented Case
View Patent ↗
Granted: May 27, 2003
Filed: May 29, 2002
Inventors
Ray Hoyer
Stephen R. Kuhn
Assignee (at issue)
Meridian Rail Information Systems Corp.
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.