Granted Patent
Utility
US 4,153,305 · App. 05/882,791
Railroad air brake systems
Inventors:
Leroy P. Kennedy, James Kalkstein
Patented Case
View Patent ↗
Granted: May 8, 1979
Filed: Mar 2, 1978
Inventors
Leroy P. Kennedy
James Kalkstein
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.