Granted Patent
Utility
US 4,395,169 · App. 06/163,264
Drill bit
Inventors:
Takashi Kashiwagi, Hiroshi Kasutani
Patented Case
View Patent ↗
Granted: Jul 26, 1983
Filed: Jun 26, 1980
Inventors
Takashi Kashiwagi
Hiroshi Kasutani
Assignee (at issue)
Mitsubishi Kinzoku Kabushiki Kaisha
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.