Method and apparatus for knife and blade sharpening
CA 2115235 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
Both facets of a double faceted blade are simultaneously sharpened as the facets are moved across a first pair of planar abrasive coated surfaces crossing to form a vertex and to set at a total included angle nominally equal to the intended total included angle of the edge facet. A guide structure contacts and aligns the blade so that the centerline of the blade is positioned at or near the bisection of the included angle of the abrasive surfaces. The guide structure is one or more rotatable members.
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 February 8, 1994 and granted January 9, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 8, 2016.
- 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.