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Expired Canadian patentCanada

Tubeless heat recuperator

CA 1070668 A · Owner: Steel Company Of Canada · Inventors: Hunter, Robert F.

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

This invention provides a method and apparatus for transferring heat to a cooler gas from a hotter gas which contains tri-atomic molecules with good infrared energy absorption characteristics, for example CO2. The hotter gas is passed in a first direction along a conduit, and simultaneously the cooler gas is jetted through and across the hotter gas in a direction transverse to the hotter gas direction. This allows the tri-atomic molecules minimally entrained in the cooler gas jets to provide heat to the cooler gas firstly through transferring their initial kinetic energy to the cooler gas molecules by way of collision, and secondly by absorbing infra-red energy radiated from the hotter gas …

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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 January 29, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJanuary 29, 1980
Term endedJanuary 29, 1997
Patent numberCA 1070668 A
Classification (IPC)F28C3/02 +1 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Patent grantedJan 29, 1980Term endedJan 29, 1997

Sources & verification

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