Method of surface hardening a cutting blade and self-sharpening blade
CA 2220608 A1 · Owner: Boardman, Bruce Earl · Inventors: Hopkins, John William; Boardman, Bruce Earl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making a self-sharpening cutting blade from a blank comprises the steps of identifying a leading edge, designating a targeted portion of the rear surface and quickly, heating the targeted portion including the leading edge. In addition a cutting blade has, selectively hardened surfaces allowing the blade to maintain its sharpness by promoting deterioration of underlying material rather than of the leading edge.
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 November 27, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 27, 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.