Granted Patent
Utility
US 4,986,192 · App. 07/336,344
Railway truck bolster friction assembly
Inventor:
Donald Wiebe
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Apr 11, 1989
Inventor
Donald Wiebe
Assignee (at issue)
A. Stucki Company Division of Hansen, Inc.
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.