Granted Patent
Utility
US 4,352,416 · App. 05/859,259
Cast iron railroad brake shoes
Inventors:
Hugo R. Larson, Chandi P. Biswas
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Dec 12, 1977
Inventors
Hugo R. Larson
Chandi P. Biswas
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.