Granted Patent
Utility
US 4,273,052 · App. 05/889,845
Spike driving apparatus
Inventors:
John Woolner, Emeric Gaslevic, Richard B. Doorley
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Mar 24, 1978
Inventors
John Woolner
Emeric Gaslevic
Richard B. Doorley
Assignee (at issue)
Portec, 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.