An improved obturator body for use in filling an endodontically prepared root canal
CA 2131088 C · Owner: Johnson, William B. · Inventors: Johnson, William B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved obturator body for use in filling an endodontically prepared root canal formed of an elongated slender body of plastic material having a proximal end and a distal end the body having a, short length handle portion at the proximal end and a shaft portion extending from the handle portion to the distal end; the shaft portion being dimensioned to be received in an endodontically prepared root canal and having a texture surface adapted to receive filler material thereon and a plurality of integral spaced apart length indicators formed on the exterior surface of the shaft portion for indicating the length of the shaft to the distal end. In one preferred arrangement the, body shaft …
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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 April 1, 1992 and granted February 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2014.
- 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.