Granted Patent
Utility
US 4,396,363 · App. 06/301,862
Small reciprocating pump
Inventors:
Hiroshi Sakamaki, Susumu Sugishita, Yukio Horikoshi
Patented Case
View Patent ↗
Granted: Aug 2, 1983
Filed: Sep 14, 1981
Inventors
Hiroshi Sakamaki
Susumu Sugishita
Yukio Horikoshi
Assignee (at issue)
NIPPON PISTON RING 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.