Heater
CA 2001309 A1 · Owner: Gilham, Richard James · Inventors: Gilham, Richard James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heater has a fire box which has a front wall a, rear wall, two parallel side walls, a top and a base a, door in the front wall, a primary air inlet to the fire box above the door, and a secondary air inlet to the fire box near the top. The heater also has a second skin over the fire box so that air can pass in a gap between the second skin and the fire box before passing through the primary secondary and tertiary air inlets.
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 October 23, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2011.
- 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.