Granted Patent
Utility
US 5,509,546 · App. 08/292,880
Magnetically-actuated coupler for model railroad cars
Inventor:
Robert H. Staat
Patented Case
View Patent ↗
Granted: Apr 23, 1996
Filed: Aug 19, 1994
Inventor
Robert H. Staat
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.