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Expired Canadian patentCanada

Viscous fluid type heat generator with heat-generation performance changing unit

CA 2200418 C · Owner: Hirose, Tatsuya · Inventors: Hirose, Tatsuya; Ban, Takashi; Mori, Hidefumi

CIPO record

Overview

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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 viscous fluid type heat generator including a drive shaft for receiving a rotative drive force from an external drive source and mounting thereon a plurality of rotor elements to be rotated together with the drive shaft, a housing assembly in which at least one first heat generating component chamber confining therein a heat generative viscous fluid to which a shearing action is applied by the rotor elements a second, heat-generating-performance variable chamber confining a heat generative viscous fluid to which shearing action is applied by the rotor element, and a heat receiving chamber in which heat exchanging liquid flows therethrough to receive heat from the first and second heat …

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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 March 19, 1997 and granted November 30, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2017.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2019.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 19, 1997
GrantedNovember 30, 1999
Term endedMarch 19, 2017
Patent numberCA 2200418 C
Classification (IPC)F24J3/00

Timeline

Timeline From CIPO dates

1998200020022004200620082010201220142016Application filedMarch 19, 1997Patent grantedNov 30, 1999Term endedMarch 19, 2017

Sources & verification

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