Granted Patent
Utility
US 5,152,409 · App. 07/631,800
Draft gear assembly
Inventor:
Howard Sommerfeld
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Dec 21, 1990
Inventor
Howard Sommerfeld
Assignee (at issue)
Westinghouse Air Brake Co.
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.