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Expired Canadian patentCanada

Heat transfer elements

CA 1114589 A · Owner: Davidson, Maxwell W. · Inventors: Davidson, Maxwell W.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A heat transfer wall comprises a plastics panel with a plurality of studs or rods of high thermal conductivity material extending transversely through the panel. The surfaces of the panel may carry a high thermal conductivity lining and the rods may project from the panel surfaces.

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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 December 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 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.
FiledAugust 10, 1978
GrantedDecember 22, 1981
Term endedDecember 22, 1998
Patent numberCA 1114589 A
Classification (IPC)B23P15/26 +2 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedAug 10, 1978Patent grantedDec 22, 1981Term endedDec 22, 1998

Sources & verification

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