Granted Patent
Utility
US 4,577,494 · App. 06/524,724
Apparatus and method for measuring the wear of railroad rail
Inventor:
Hans P. Jaeggi
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Aug 19, 1983
Inventor
Hans P. Jaeggi
Assignee (at issue)
Jackson Jordan, 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.