Screen adapted to be placed in front of a hearth fire or other source of radiant heat
CA 2024073 A1 · Owner: Ratelband, Johannes B. · Inventors: Ratelband, Johannes B.; Ratelband, Johannes B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A screen adapted to be placed in front of a hearthfire or other source of radiant heat. A screen is provided for heating a room by convection using the heat from a radiation heat source e.g. an open, hearth fire, a gas-fire or an electric radiant heater and, when the heat source is an open hearth fire for use as a fire-guard preventing sparks or other small particles of combustion from entering the room in which the fire is located. The screen includes a row of at least with their upper portions spaced apart vertical pipes having each at or near their lower end an inlet opening and at or near their upper end an outlet opening for air sucked from the room by the chimney-action of the warm …
Read the whole patent
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 August 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.