Granted Patent
Utility
US 4,304,359 · App. 06/115,931
Rail fastener
Inventor:
Richard L. Fischer
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Jan 28, 1980
Inventor
Richard L. Fischer
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.