Granted Patent
Utility
US 4,940,001 · App. 07/269,074
Rail spike cleaning apparatus
Inventor:
John D. Holley
Patented Case
View Patent ↗
Granted: Jul 10, 1990
Filed: Nov 9, 1988
Inventor
John D. Holley
Assignee (at issue)
Holley Engineering Company, 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.