Granted Patent
Utility
US 4,493,645 · App. 06/509,809
Device for opening and closing a chuck for a dental handpiece
Inventor:
Takasuke Nakanishi
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Jun 30, 1983
Inventor
Takasuke Nakanishi
Assignee (at issue)
Nakanishi Dental Mfg. 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.