Granted Patent
Utility
US 5,144,985 · App. 07/764,698
Variable load valve for railway vehicles
Inventor:
Hideo Tamamori
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Sep 24, 1991
Inventor
Hideo Tamamori
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.