Martensitic stainless steel
CA 2055154 C · Owner: Schumacher, William J. · Inventors: Schumacher, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A substantially martensitic stainless steel as cast having good castability ductility and capability of being hardened to a wide range of hardness the , steel, consisting essentially of in weight percent, up to about 0.08 % carbon about , 1.0, to about 4.0 % manganese, about 13.0 to about 17.0 % chromium about 1.5 to, about 4.0 % copper, up to about 0.12 % nitrogen less than about 1.0 % , silicon, less than about 1.0 % molybdenum less than 1.0 % nickel, less than about 0.03 % phosphorus, less than about 0.5 % sulfur up to about 0.005 % boron, up to, 0.5 % niobium vanadium, titanium and / or zirconium and balance essentially iron. The steels have particular utility in the production of cast …
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 November 7, 1991 and granted January 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 2013.
- 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.