Device for opening and closing a chuck for a dental handpiece
CA 1238806 A · Owner: Nakanishi Dental Mfg. Co. Ltd. · Inventors: Nakanishi, Takasuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improvements in a device for opening and closing a chuck for a dental handpiece ABSTRACT OF DISCLOSURE, A device of this invention for opening and closing a chuck for a dental handpiece comprises a handle portion and a powerhead assembly including a driving shaft having adjacent, to its outer orifice, a forward outwardly tapering inner periphery defining a small caliber rear periphery and a large caliber front periphery. A cylindrical chuck having an axially hollow portion a forward outwardly tapering outer periphery a small caliber, rear periphery and a large caliber front periphery corresponding, to the forward outwardly tapering inner periphery the small caliber, rear periphery, and the …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 5, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.