Ultra-high strength steels with excellent cryogenic temperature toughness
CA 2316968 A1 · Owner: Exxonmobil Upstream Research Company · Inventors: Koo, Jayoung; Bangaru, Narasimha-Rao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ultra-high strength, weldable, low alloy steel containing less than 9 wt.% , nickel, with excellent cryogenic temperature toughness in the base plate and in the heat affected zone (HAZ) when welded having a tensile strength greater , than 830 MPa (120 ksi) and a microstructure comprising predominantly finegrained lath martensite and/or fine-grained lower bainite is prepared by , heating a steel slab comprising iron and some or all of the additives carbon manganese, nickel, nitrogen, copper, chrominum molybdenum, silicon, niobium, vanadium titanium, aluminum, and boron; reducing the slab to form plate in one or more passes in a temperature range in which austenite recrystallizes; …
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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 18, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 18, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2020.
- 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.