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Expired Canadian patentCanada

Oscillating air dispensers for microwave oven

CA 2107937 C · Owner: Patentsmith Ii, Inc. · Inventors: Sparman, Alden B. Sr.; Smith, Donald P.; Dobie, Michael J.

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

Apparatus for transferring heat between temperature controlled air dispensed from a pair of oscillating ducts and a food product in a cabinet having an interior compartment bounded by front side, and rear walls. A foraminous partition having a, central portion and extremities is mounted to divide, the interior of the cabinet into a cooking chamber and an air conditioning chamber. It is configured to encircle a portion of the cooking chamber such that the air conditioning chamber extends around a major part of the periphery of the cooking chamber wherein air is drawn along multiple paths toward side walls and toward the rear wall from the cooking chamber.

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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

  • Filed October 7, 1993 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 7, 2013.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 7, 2015.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 7, 1993
GrantedAugust 20, 2002
Term endedOctober 7, 2013
Patent numberCA 2107937 C
Classification (IPC)F24C7/02 +2 more

Timeline

Timeline From CIPO dates

1994199619982000200220042006200820102012Application filedOct 7, 1993Patent grantedAug 20, 2002Term endedOct 7, 2013

Sources & verification

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