Method for sharpening a chipper knife
CA 2184228 C · Owner: Jorgensen, Ray B. · Inventors: Jorgensen, Ray B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sharpening the cutting edge of a chipper knife having a chip-breaking shoulder in its underside remote from the cutting edge apex which is integral with the chipper knife is effected by removing a layer of material of uniform thickness from the underside of the cutting edge and thereby removing the bluntness of a dulled cutting edge and forming a resharpened cutting edge having the same wedge angle as the cutting edge prior to resharpening.
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 August 27, 1996 and granted March 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 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.