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Expired Canadian patentCanada

Zircon and mgo preheatable insulating refractory liners and methods of use thereof

CA 1234580 A · Owner: Consolidated Ceramic Products, Inc. · Inventors: Johnson, Howard B.

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Abstract From the Canadian patent

Novel preheatable molded refractory insulating liners and methods of use thereof for lining vessels, such as hot tops, ladles, tundishes troughs, and pipes, etc. which serve to transfer molten metals, such as ferrous alloys, are disclosed. The new and vastly improved preheatable liners are suitable for developing effectively the required hot strength needed for casting molten metals at both vessel preheat temperatures and casting temperatures. The unique preheatable liners additionally possess the needed hot strength during the range of casting temperatures as are experienced in the metal making industry. The preheatable molded refractory insulating liners comprise a liner structure 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 29, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 29, 2005.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 22, 1985
GrantedMarch 29, 1988
Term endedMarch 29, 2005
Patent numberCA 1234580 A
Classification (IPC)C04B35/04

Timeline

Timeline From CIPO dates

1986198819901992199419961998200020022004Application filedAug 22, 1985Patent grantedMarch 29, 1988Term endedMarch 29, 2005

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