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Expired Canadian patentCanada

Apparatus for cleaning air ports of a chemical recovery furnace

CA 1314447 C · Owner: Anthony-Ross Company · Inventors: Goodspeed, Byron 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

Abstract, Removable apparatus for cleaning excrescent material from air ports in a chemical recovery furnace. A metal cleaning head having a cage-like configuration is pivotally mounted inside a wind box associated with the furnace to a frame adjacent an air port, and is adapted for insertion into the air port for cleaning the peripheral edges of the air port without blocking air flow through the port or obstructing the viewing path through the air port of sensing devices mounted exteriorly of the wind box. The frame to which the cleaning head is attached rests inside the wind box on the floor thereof, and is adjustably attached for positioning adjacent the air port to a mounting plate …

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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 March 16, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 16, 2010.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 1, 1987
GrantedMarch 16, 1993
Term endedMarch 16, 2010
Patent numberCA 1314447 C
Classification (IPC)D21C7/14

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedDec 1, 1987Patent grantedMarch 16, 1993Term endedMarch 16, 2010

Sources & verification

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