System for modifying acoustic environment
CA 2000599 A1 · Owner: Russell, John F. · Inventors: Pearce, Grant N.; Russell, John F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A system for modifying an acoustic environment (10), which in an embodiment may be a recording studio by the provision of modular absorption and/or diffusion elements (12) which can be located at the walls or ceiling of the space constituting the acoustic environment. Each modular element (12) may be one of three types; the first type providing variable absorption, the second type providing variable absorption in a mutually exclusive frequency range to the first type, and the third type providing variable absorption or alternatively diffusion over a broad frequency range. Each modular element (12) contains a local control means (11) to effect the variation, and an external actuation sensor …
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 12, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2011.
- 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.