Copper strip or sheet with a brown cover layer and methods for its production
CA 2179097 C · Owner: Priggemeyer, Stefan · Inventors: Priggemeyer, Stefan; Hoveling, Stefan; Triquet, Christian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A copper strip or sheet having a red-brown to dark brown cover layer. The cover layer includes a first layer of Cu2O which adheres to the base metal, with a thickness in the range of 0.05 to 5 µm, preferably in the range of 0.1 to 1 µm, and a second layer of CuO arranged on top of the first layer, with a thickness between 1 and 100 nm preferably with a thickness between 10 and 50 nm. The cover layer is applied by heat treating the copper base to form a Cu2O layer, followed by a second heat treatment to form a CuO layer. Alternatively, the cover layer is applied by heat treating the copper base in an oxygen containing atmosphere followed by treatment with an aqueous solution of a salt which …
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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 13, 1996 and granted January 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 13, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 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.