Methods and apparatus for the detection of dental caries
CA 2537338 A1 · Owner: Longbottom, Christopher · Inventors: Pitts, Nigel Berry; Los, Przemyslaw; Longbottom, Christopher
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for the electronic detection of dental caries comprises at least one probe electrode placed in electrical contact with the surface of a patient's tooth and a second, electrode placed in electrical contact with another part of the body of the patient; an alternating electrical current is passed between the probe and the second electrode. The frequency of the alternating current is varied over a predetermined frequency range and the electrical impedance between the electrodes is measured for a number of frequency values within the range. A variety of probe designs to suite different types of teeth and different tooth surfaces generally comprise an insulating substrate of …
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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 May 13, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 13, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 13, 2019.
- 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.