Granted Patent
Utility
US 6,161,582 · App. 09/050,690
Ball cock for railway vehicle
Inventors:
Yoshio Asano, Osamu Akamatsu, Mitsumasa Morita, Yoshio Suetaka
Patented Case
View Patent ↗
Granted: Dec 19, 2000
Filed: Mar 30, 1998
Inventors
Yoshio Asano
Osamu Akamatsu
Mitsumasa Morita
Yoshio Suetaka
Assignee (at issue)
Westinghouse Air Brake Co.
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.