Method and apparatus for knife and blade sharpening
CA 2173898 C · Owner: Friel, Daniel D. · Inventors: Friel, Daniel D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for sharpening the edge of an elongated object includes a housing having an exposed sharpening section with a sharpening element in the sharpening section. The sharpening element is formed from a single abrasive coated sharpening element having a pair of abrasive coated planar comb-like structures formed along opposing sides of the sharpening element. The sharpening element is bent into an X configuration wherein the alternating teeth and slots interdigitate to form the X-shaped configuration and form a sharpening angle between the interdigitating teeth. The sharpening angle has a bisection line with an elongated interrupted sharpening surface. Each of the teeth from one of the …
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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 11, 1996 and granted May 30, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 11, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 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.