High strength, high fracture toughness alloy
CA 2073460 C · Owner: Schmidt, Michael L. · Inventors: Schmidt, Michael L.; Novotny, Paul M.; Hemphill, Raymond M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high strength, high fracture toughness steel alloy consisting essentially of, in weight percent about , C 0.2-0.33, Mn 0.20 max. Si 0.1 max. P 0.008 Max S 0.004 max. Cr 2-4, Ni 10.5-15, Mo 0.75-1.75 Co 8-17, Ce effective, amount-0.030, La effective amount-0.01 Fe balance, and an, article made 'therefrom are disclosed. A small but effective amount of calcium can be present in this alloy in substitution for some or all of the cerium and lanthanum. The alloy is an age-hardenable martensitic steel alloy which provides a unique combination of tensile strength and fracture toughness. The alloy provides excellent mechanical properties when hardened by vacuum heat treatment with inert gas cooling …
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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 February 5, 1991 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 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.