Method for surface treatment of a metallic material
CA 2176291 C · Owner: Wickman, Lena Maria-Louise · Inventors: Wickman, Lena Maria-Louise; Johansson, Bror Thomas; Ainali, Markku Sakari
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 method for creating an artificial patina on the surface of a copper-bearing material using a patination agent applied to the surface of the material after it has been installed in a final location of use. The precipitate of the patination agent is filtered and washed and its content in the patination agent is adjusted within the range of 15 to 50% by weight of the patination agent after filtering. The patination agent is stored at a temperature below 5°C until it is used.
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 10, 1996 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 10, 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.