A ventilating system
CA 2300441 A1 · Owner: Orii, Tsunekazu · Inventors: Orii, Tsunekazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a ventilating system with an air passage communicating between an outdoor side and an indoor side, it is an object to preventing noise entering from the outdoor side and sound escaping from the indoor side and to preventing outdoor air invading at wind speed over a specific value. In an air passage (14) a part of which is defined by a hexagonal frame main body (9) whose cross section is reduced gradually from outdoor side (2) to indoor side (3), a sound deadening member which is a hexagonal sound absorbing cone member (20) comprising an outside sound deadening portion which is a first hexagonal cone (21) whose apex (24) is directed to the outdoor side (2) and an inside sound deadening …
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 March 10, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2022.
- 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.