Granted Patent
Utility
US 4,861,238 · App. 07/059,535
Pulsation preventive member for pump
Inventors:
Akira Kamiyama, Nobuo Yamagisawa, Nobuyuki Oshima
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Jun 8, 1987
Inventors
Akira Kamiyama
Nobuo Yamagisawa
Nobuyuki Oshima
Assignee (at issue)
Mitsuba Electric Manufacturing 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.