Steel for making very large pipe molds
CA 2110199 C · Owner: Nfip, Inc. · Inventors: Khare, Ashok K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ferritic alloy steel that may be used for making very large pipe molds with high ductility and high toughness for centrifugally casting pipe with an inside diameter that may exceed 40 inches, the steel consisting essentially of from about 0.12% to about 0.18% carbon about, 0.70% to about 0.95% manganese, about 0.008% maximum phosphorous, about 0.008% maximum sulphur about 0.20% to, about 0.35% silicon, about 1.05% to about 1.25% nickel about 1.85% to about 2.25% chromium, about 0.60% to about 0.75% molybdenum, about 0.03% to about 0.08% vanadium and, balance essentially iron.
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 November 29, 1993 and granted May 5, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2015.
- 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.