Granted Patent
Utility
US 4,217,255 · App. 06/030,411
Composition railroad friction material with synthetic fiber content
Inventor:
Arvon M. Griffith
Patented Case
View Patent ↗
Granted: Aug 12, 1980
Filed: Apr 16, 1979
Inventor
Arvon M. Griffith
Assignee (at issue)
Abex Corporation
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.