Audio equipment
CA 2059474 A1 · Owner: Smiedt, Leslie · Inventors: Smiedt, Leslie; Smiedt, Leslie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Audio equipment is disclosed which comprises a player, such as a portable compact disc player or a portable tape cassette player, and a set or earphones. The equipment includes a sound operated switch which when it responds to a, sound at a level above its response level alerts the use of, the equipment that the sound has occurred. The switch can either interrupt the audio signal to the headphones switch-, off the player or superimpose a tone on the audio signal. The equipment ensures that a person wearing the earphones is alerted to a telephone rinsing, a person speaking to him etc. The switch is preferably incorporated into a unit which can be connected between the player and the …
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 16, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2014.
- 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.