Granted Patent
Utility
US 5,394,586 · App. 08/051,367
Ballast sweeper dust control
Inventor:
John D. Holley
Patented Case
View Patent ↗
Granted: Mar 7, 1995
Filed: Apr 23, 1993
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.