Dual sonic character acoustic panel and systems for use thereof
CA 2352384 A1 · Owner: Owens Corning · Inventors: Mcgrath, Ralph D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An acoustically significant composite panel (100 300, 400, 500, 702, 1008) , having a general sound-absorbing face (or a general sound-diffusing face) and a tuned sound-absorbing face. Such a panel (100 300, 400, 500, 702, 1008) , includes a sandwich or composite of a first layer (202 402) of molding media, a honeycomb (204) of cells and a second layer (206 214) of molding media. The , first layer (202 402) has at least one or more apertures (210 1206) in it , that convert the corresponding cells (208 406, 408, 410) into Helmholtz , resonators (1200). These Helmholtz resonators (1200) can be tuned to the same or different frequencies. The second layer (206 214) is generally sound-, …
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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 December 3, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2021.
- 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.