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Expired Canadian patentCanada

Heat pump arrangement and method for material drying system

CA 1045839 A · Owner: Westinghouse Electric Corporation · Inventors: Hogan, Mark R.; Ayers, David L.

CIPO record

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

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Abstract From the Canadian patent

A mechanical refrigeration system is arranged to function as a heat pump for the purpose of drying material, such as shelled corn for example with am-, bient air being first passed through the refrigerant condenser to be heated, then passed through the material to be dried, and then passed through the refrigerant evaporator and discharged back to atmosphere.

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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 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 9, 1996.
  • 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 9, 1979
Term endedJanuary 9, 1996
Patent numberCA 1045839 A
Classification (IPC)F25B13/00 +1 more

Timeline

Timeline From CIPO dates

198019821984198619881990199219941996Patent grantedJan 9, 1979Term endedJan 9, 1996

Sources & verification

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