Granted Patent
Utility
US 6,161,463 · App. 09/195,210
Negative pressure booster equipped with electromagnetic auxillary control
Inventor:
Toshiyuki Suwa
Patented Case
View Patent ↗
Granted: Dec 19, 2000
Filed: Nov 18, 1998
Inventor
Toshiyuki Suwa
Assignee (at issue)
NISSIN KOGYO 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.