Orthogonal multiplex signal processing apparatus
CA 2046946 A1 · Owner: Kawai, Kiyoyuki · Inventors: Kawai, Kiyoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A television signal transmitter for transmitting a conventional television signal as a main signal according to a VSB system, and in-phase modulating the main signal in a DSB region of the VSB region and multiplexing the main signal with a sub signal having an orthogonal modulation. The transmitter has a first inserting circuit for inserting a reference signal into a first specific period within a vertical blanking period of the main signal a second, inserting circuit for inserting a second reference signal into every other frame of the main signal in a second specific period of within a vertical blanking period of the main signal, a first interrupting circuit for interrupting the …
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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 July 12, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 12, 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.