Granted Patent
Utility
US 4,888,845 · App. 07/182,140
Sweeping apparatus for railway ballast regulators
Inventors:
Edmund C. Ramm, John Joseph Nogan
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Apr 15, 1988
Inventors
Edmund C. Ramm
John Joseph Nogan
Assignee (at issue)
Railway Track-Work Company
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.