High strength austenitic stainless steel having excellent galling resistance
CA 2125535 C · Owner: Cordea, James N. · Inventors: Gore, Mark J.; Schumacher, William J.; Cordea, James N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A nonmagnetic austenitic stainless steel and articles produced therefrom, such as drill collars, having a 0.2% yield strength of at least 690 N/mm2 (100 ksi ), excellent resistance to intergranular stress corrosion good, ductility, good corrosion resistance very low magnetic permeability (less, than 1.004) and resistance to galling and wear which is typically at least 50% better than found in previous drill collars the steel and articles, consisting essentially of in weight percent, from greater than 0.05% to about 0.10% carbon, greater than 18% to about 22% manganese about 12.5% to, about 17% chromium, about 1.5% to about 5% nickel about 0.2% to about, 0.4% nitrogen, about 0.2% to about …
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 June 9, 1994 and granted April 27, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2016.
- 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.