Coated cutting insert
CA 2019077 C · Owner: Chatfield, Christopher · Inventors: Collin, Marianne; Lindstrom, Jan; Chatfield, Christopher
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a body coated with at least one double layer Al2O3-TiC. Because the Al2O3-layer in contact with the TiC-layer consists of kappa-Al2O3 or theta- Al2O3 an improved adherence has been obtained. A further improvement.of the properties is obtained if the body after the coating is heat treated fox 0.3-10 hours at 900-1100 °C in protecting gas atmosphere at which initially nucleated kappa- or theta-Al2O3 is transformed to finegrained alpha-Al2O3.
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 June 15, 1990 and granted December 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 15, 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.