Coated article
CA 2236138 C · Owner: Welty, Richard P. · Inventors: Moysan, Stephen R. Iii; Welty, Richard P.; Sugg, Rolin W.
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 multi-layer coating comprising a nickel layer deposited on the surface of the article a, nickel-tungsten-boron layer deposited on the nickel layer a refractory, metal, preferably zirconium layer deposited on the nickel-tungsten-boron layer, a sandwich layer comprised of alternating layers of a refractory metal and of a refractory metal compound deposited on the refractory metal layer, a refractory metal compound layer preferably zirconium nitride, deposited on the sandwich layer and, a layer comprised of a refractory metal oxide or the reaction products of a refractory metal, oxygen and nitrogen deposited on the refractory metal compound layer.
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 April 29, 1998 and granted October 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2020.
- 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.