Chimney draft inducer
CA 2240247 A1 · Owner: Page, Calvin A. · Inventors: Page, Calvin A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chimney draft inducer installed on a chimney flue having a feed tube extending, from the chimney flue with a plurality of vortex stabilizers extending radially from the feed, tube to a cylindrical negative pressure plenum member forming a plurality of quasi-venturi, chambers therebetween with a conical member positioned above the chimney flue in contact, with the vortex stabilizers having an opening between such conical member and feed tube, the conical member having a plurality of arches formed in its bottom each , arch coming to a, pointed tip with such pointed tips positioned within each of the quasi-venturi chambers such, that air passing down the conical member speeds up when …
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 June 10, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2020.
- 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.