Headphone cassette recorder and method of controlling operation thereof
CA 2050972 A1 · Owner: Park, Sung G. · Inventors: Park, Sung G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A headphone cassette recorder including a remote control transmitting unit having a first select key adapted to select among PLAY, STOP and DIRECTION operation modes and a second select between key adapted to select FAST FORWARD and REW operation modes. Signals of different voltage levels outputted from respective select keys are applied to a remote control receiving unit, via a single line. When the first select key is touched on or pressed one time, under the initial STOP state the operation, mode becomes PLAY. When the first select key is touched on one time again, under the PLAY state the operation, mode becomes STOP. When the first select key is double touched on or pressed twice, …
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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 September 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 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.