Plunge jointer for planer knives
CA 2017372 C · Owner: Groghan, Charles L. · Inventors: Johnson, David J.; Groghan, Charles L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A base is arranged to be secured to the support frame of a planer and supports a slide for movement toward and away from the planer knife head. The slide supports a grinding stone, and a lever connected between the base and the slide is arranged to move the slide and the stone toward and away from the knife head. The guard for the knife head on the planer has an opening through which the present jointing apparatus works. An adjustable stop is provided between the jointer base and the slide to provide precision operation of the slide and the stone in jointing operations.
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 May 23, 1990 and granted September 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2012.
- 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.