Diamond-coated article with integral wearout indicator
CA 2102159 A1 · Owner: Pinneo, John Michael · Inventors: Pinneo, John Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A diamond-coated article comprises a first electrically-conductive diamond, layer disposed on a substrate and a second electrically-insulating diamond layer disposed over the electrically-conductive diamond layer. The article may be fabricated by a process including the steps of forming a thin, electrically conductive layer of diamond immediately adjacent to the surface of the substrate of the diamond-coated article followed by further, formation of electrically-insulating diamond material on top of the electrically-conducting layer. A method for indicating wear of the article comprises the steps of passing a current between the tool and the workpiece and detecting a change in the flow 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 November 1, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 1, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 1, 2015.
- 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.