Granted Patent
Utility
US 6,172,860 · App. 09/161,379
DC power source unit alarming before electrically powered tool is overheated and stopping power supply thereafter
Inventors:
Chikai Yoshimizu, Hiroaki Orikasa, Takahiko Shimada, Shigeru Shinohara, Eiji Nakayama, Kazuhiko Funabashi, Atsushi Nakagawa
Patented Case
View Patent ↗
Granted: Jan 9, 2001
Filed: Sep 28, 1998
Inventors
Chikai Yoshimizu
Hiroaki Orikasa
Takahiko Shimada
Shigeru Shinohara
Eiji Nakayama
Kazuhiko Funabashi
Atsushi Nakagawa
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.