Coated substrate
CA 2193558 C · Owner: Baldwin Hardware Corporation · Inventors: Sugg, Rolin W.; Moysan, Stephen R. Iii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An article is coated with a multilayer coating comprising a nickel layer deposited on the surface of the article a gold layer, deposited on the nickel layer a ruthenium layer deposited on the, gold layer a refractory metal, preferably zirconium layer, deposited on the ruthenium layer and a refractory metal compound, preferably zirconium nitride deposited on the refractory metal, layer. The coating provides the color of polished brass to the article and also provides abrasion and corrosion protection.
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 December 20, 1996 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 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.