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Expired Canadian patentCanada

Liquid spray air purification and controlled humidification apparatus with air quality monitor and controller

CA 2175294 C · Owner: Sewell, Frederic D. · Inventors: Sewell, Frederic D.; Jones, Barry D.

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 water spray-based air purification system having a humidification portion and a dehumidifying portion is operatively installed in an air handling unit used to recirculate air within a conditioned space. A blower within the air handling unit housing operates to draw return air into the housing, flow the air across the entire air purification system, and then discharge the purified and humidified air back into the conditioned space. A water spray portion of the purification system is served by a pump forcing water from a sump structure through a filter, with the spray water draining back into the sump after cleansing air traversing the purification system. Upon a sensed demand therefor, an …

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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 April 29, 1996 and granted June 20, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2016.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2018.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 29, 1996
GrantedJune 20, 2000
Term endedApril 29, 2016
Patent numberCA 2175294 C
Classification (IPC)B01D47/06 +2 more

Timeline

Timeline From CIPO dates

1997199920012003200520072009201120132015Application filedApril 29, 1996Patent grantedJune 20, 2000Term endedApril 29, 2016

Sources & verification

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