Air actuated damper
CA 2055780 A1 · Owner: Jackson, Bert W. · Inventors: Jackson, Bert W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved air actuated damper device (10 30), is described. The damper comprises a cylindrical conduit (11, 31) that can be joined to a flue pipe (17) at a proximal end (11b, 31b) of the damper device; a damper support beam (13, 33) across the conduit offset above a longitudinal axis (a-a, c-c) of the conduit; and a damper blade (15, 35) that pivots on a pivot axis (b-b e-e), The, damper blade is comprised of an upper section (15a 35a), and a lower section (15b, 35b) so that the damper blade pivots on the pivot axis and opens when gas flows through the conduit and closes to seal against sealing lips (11e 31e) and (11f, 31f) extending from and into the conduit when there is no gas flow. …
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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
- Filed November 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 2013.
- 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.