Rotating blade damper with blade lock and stop mechanism
CA 2026745 A1 · Owner: Hill, James R. · Inventors: Hill, James R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotating blade damper for an air handling system, the damper having a perimetrical frame and a blade or a plurality of blades each of which is rotatable with respect to the frame between a flow permitting position and a flow blocking position. Each blade is biased toward its flow blocking position but is normally retained in its flow permitting position for example, by a fusible link. In the event of a fire or other condition of excessive temperature the fusible link of a damper incorporating such a product will fail and each blade will rotate to its flow blocking position. A stop and lock mechanism is provided to stop each blade in a predetermined open or flow permitting position and to …
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 2, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 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.