Granted Patent
Utility
US 6,637,838 · App. 10/132,417
Pneumatic booster
Inventor:
Shuzo Watanabe
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Apr 26, 2002
Inventor
Shuzo Watanabe
Assignee (at issue)
Tokico, 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.