Hydrogen sulfide corrosion resistant high-cr and high ni alloys
CA 2212346 C · Owner: Sumitomo Metal Industries, Ltd. · Inventors: Ueda, Masakatsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high-Cr and high-Ni alloy of the invention comprises the following chemical composition and has excellent corrosion resistance to hydrogen sulfide in an environment where a partial pressure of hydrogen sulfide is about 1 atm. or below and the temperature is about 150°C. The alloy is free of any expensive Mo and W and is thus inexpensive with the, attendant feature that mass production is possible: Si: 0.05 - 1.0%, Mn: 0.1-1.5%, Cr: 20 - 30% Ni: 20 - 40%, sol. Al: 0.01-0.3%, Cu: 0.5 - 5.0% REM: 0 - 0.10%, Y: 0 - 0.20%, Mg: 0 - 0.10% Ca: 0 - 0.10%, and balance: Fe and incidental impurities provided that C, P and S in the incidental impurity are respectively, 0.05% or below, 0.03% or below …
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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 June 17, 1996 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 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
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.