Metallurgical method for processing nickel- and iron-based superalloys
CA 2299430 C · Owner: Lin, Peter Keng-Yu · Inventors: Lin, Peter Keng-Yu; Palumbo, Gino; Limoges, David L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for improving the microstructure of nickel- and ironbased precipitation strengthened superalloys used in high temperature applications by increasing the frequency of "special" low-, .SIGMA.CSL grain boundaries to levels in excess of 50 9'0. Processing entails applying specific thermomechanical processing sequences to precipitation hardenable alloys comprising a series of cold deformation and recrystallization-annealing steps performed within specific limits of deformation, temperature, and annealing time. Materials produced by this process exhibit significantly improved resistance to high temperature degradation (e.g. creep, hot corrosion etc.), enhanced weldability, …
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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 August 4, 1998 and granted December 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 4, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 4, 2020.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.