Dental instrument for preventing accidental swallow
CA 2004900 C · Owner: Sugiyama, Masahiro · Inventors: Sugiyama, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dental instrument to prevent accidentally swallowing a filler, etc. has a circumferential wall for drop prevention mounted on the periphery of a receiving plate. A grip is attached to the receiving plate or circumferential wall. The dental instrument is inserted in the mouth to catch the prosthetic appliance filler, etc. coming off during a dental treatment preventing the, prosthetic appliance, filler etc. from dropping into the, trachea or gullet.
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
- Filed December 7, 1989 and granted June 28, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2011.
- 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.