Granted Patent
Utility
US 4,781,105 · App. 07/032,105
Spring brake cylinder
Inventors:
Yasuhisa Hata, Osamu Akamatsu
Patented Case
View Patent ↗
Granted: Nov 1, 1988
Filed: Mar 27, 1987
Inventors
Yasuhisa Hata
Osamu Akamatsu
Assignee (at issue)
Nippon Air Brake Co., Ltd.
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.