Granted Patent
Utility
US 6,557,648 · App. 09/978,077
Operation mode switching mechanism for a hammer drill
Inventors:
Toshihiro Ichijyou, Shinichirou Satou, Akira Teranishi, Yukio Terunuma
Patented Case
View Patent ↗
Granted: May 6, 2003
Filed: Oct 17, 2001
Inventors
Toshihiro Ichijyou
Shinichirou Satou
Akira Teranishi
Yukio Terunuma
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.