Granted Patent
Utility
US 5,041,990 · App. 07/424,002
Method and apparatus for measuring entrained gas bubble content of flowing fluid
Inventors:
Junsuke Yabumoto, Hisashi Yano
Patented Case
View Patent ↗
Granted: Aug 20, 1991
Filed: Oct 19, 1989
Inventors
Junsuke Yabumoto
Hisashi Yano
Assignee (at issue)
Mitsubishi Oil 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.