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Expired Canadian patentCanada

Curing ingot mold stool patch by aluminum powder and iron oxide

CA 1108404 A · Owner: Nalco Chemical Company · Inventors: Reven, Frederick V.

CIPO record

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Abstract From the Canadian patent

3257, In the United States Patent Office APPLICATION OF FREDERICK V. REVEN, FOR METHOD OF CURING INGOT MOLD STOOL PATCHES ABSTRACT OF THE DISCLOSURE, Anchored plastic refractory ingot mold stool patches of the type requiring thermal curing may be cured by placing over the surface of the patch an aluminum-iron oxide thermite powder and then igniting the powder to cause it to burn thereby curing the patch.

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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 September 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 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.
FiledSeptember 27, 1978
GrantedSeptember 8, 1981
Term endedSeptember 8, 1998
Patent numberCA 1108404 A
Classification (IPC)C09K5/00

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedSep 27, 1978Patent grantedSep 8, 1981Term endedSep 8, 1998

Sources & verification

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