Rotary handpiece for endodontic instruments
CA 2184329 C · Owner: Roane, James B. · Inventors: Roane, James B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an improved rotary handpiece for cleaning and enlarging the root canal of a tooth with a rotary endodontic file. The handpiece includes a retractable support rod attached to and extending from the handpiece positioned adjacent and substantially parallel to the endodontic file. The support rod is adapted to rest on a tooth whereby the retraction of the support rod controls the advance of the endodontic file into the root canal. The control of the advance of the endodontic file insures that the file does not self thread into the canal or become excessively loaded whereby it sticks or breaks off while the root canal is being cleaned and enlarged.
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 August 28, 1996 and granted July 6, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 2018.
- 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.