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Expired Canadian patentCanada

Low carbon ni-cr austenitic steel having an improved resistance to stress corrosion cracking

CA 1097948 A · Owner: Sumitomo Metal Industries, Ltd. · Inventors: Fujikawa, Hisao; Kowaka, Masamichi

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Abstract From the Canadian patent

Herein disclosed is a low carbon austenitic steel having an improved resistance to stress corrosion cracking. The austenitic steel consists essentially of by weight; less than, 0.029% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3.0% of manganese; 23 to 45% of nickel; 20 to 35% of chromium; 0.5 to 4.0% of vanadium; titanium in an amount of at least 5 times carbon content and up to 1% of the total composition and/or niobium in an, amount of at least 7 times carbon content and up to 1% of the total composition, and/or zirconium in an amount of at least 7 times carbon content and up to 1% of the total composition and/, or tantalum in an amount of at least 7 times carbon content and up to 2% of …

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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

  • Granted March 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 1, 1978
GrantedMarch 24, 1981
Term endedMarch 24, 1998
Patent numberCA 1097948 A
Classification (IPC)C22C38/50 +2 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedMarch 1, 1978Patent grantedMarch 24, 1981Term endedMarch 24, 1998

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.