Pd-added austenitic stainless steel for use for high temperature concentrated sulfuric acid
CA 2043034 C · Owner: Ukawa, Naohiko · Inventors: Yamada, Tamotsu; Nishimura, Yasuo; Nakamoto, Hideo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An austenitic stainless steel for use for high temperature concentrated sulfuric acid which comprises on weight basis, 0.04 % or less of C, 5 - 7 % of Si 2 % or less of Mn, 15 - 25 % of Cr, 4 - 24 % of Ni 0.01 - 1.07 % of Pd and the rest consisting of Fe and unavoidable contaminant materials. By the incorporation of small amount of palladium in a basal austenitic stainless steel containing the essential three elements of Cr, Ni and Si, a superior corrosion resistance against highly concentrated high temperature sulfuric acid is attained.
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 May 22, 1991 and granted April 9, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 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.