Fireplace insert
CA 1191059 A · Owner: Onward Hardware Limited Through Its Division Onward Industries · Inventors: Witzel, Ted. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved double walled prefabricated fireplace apparatus insertable into a pre-existing masonry fireplace in a building for heating a room. The apparatus is provided with an air manifold within the apparatus adjacent the combustion chamber and having opposite mutually spaced walls through one of which an inlet for room air is provided and through the other of which an inlet for fresh outside air is provided. The manifold is further provided with an outlet for enabling air to flow to the air heating chamber between the double walls. A manually adjustable air flow control means is provided slidable within the manifold between two positions one blocking the, flow of air through the room air …
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
- Granted July 30, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 30, 2002.
- 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.