Varying loudspeaker spatial characteristics in a vehicle
CA 2033887 A1 · Owner: Mcfadyen, Richard · Inventors: Liebel, Craig; Mcfadyen, Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A shifting control is operative in a first region for varying the treble and midrange components of a sound signal as variously applied to the speakers of a multispeaker system while the bass component remains unchanged, and is operative in a second region wherein all frequency components can be substantially attenuated.
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 January 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 9, 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.