Granted Patent
Utility
US 4,946,052 · App. 07/351,066
Gravity wedge for slackless railcar connections
Inventors:
John W. Kaim, Horst T. Kaufhold
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: May 12, 1989
Inventors
John W. Kaim
Horst T. Kaufhold
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.