Stainless alloys for enhanced corrosion resistance
CA 2303750 A1 · Owner: Hodgson, David · Inventors: Hodgson, David; Rodda, John; Cameron, Gordon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved stainless alloy has application in handling concentrated sulfuric acid. The alloy, of the invention preferably comprises 23 to 33% chromium more than 20% , nickel, 6% or, more of silicon 0.2% to 0.4% nitrogen and minor amounts of molybdenum copper, and, tungsten with the balance iron. The alloy offers superior corrosion resistance by, comparison with the standard stainless steels over the range from 90% sulfuric acid into, the oleum range. The alloy is readily weldable and may be used in either cast or wrought, form. After heat treating the alloy acquires a duplex structure which has a mixture of, austenite and ferrite phases. The heat-treated alloy is ductile.
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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 April 6, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2022.
- 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.