Granted Patent
Utility
US 6,073,521 · App. 09/267,609
Pneumatically operable screw driver
Inventors:
Akira Uno, Michio Wakabayashi, Yasuki Ohmori, Yasuo Sasaki
Patented Case
View Patent ↗
Granted: Jun 13, 2000
Filed: Mar 15, 1999
Inventors
Akira Uno
Michio Wakabayashi
Yasuki Ohmori
Yasuo Sasaki
Assignee (at issue)
Hitachi Koki 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.