Transmission of fm video signals over various lines
CA 2294520 C · Owner: Abraham, Charles · Inventors: Abraham, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for electrical line communications using FM video modulation includes FM video modulation circuits (58 66) and , an impedance matching coupler (52 68) at each of two or more locations along a pair of lines. The impedance matching couplers (52 68) provide impedance matching, utilizing an air-core preselected frequency band, sufficient to allow low-loss transmission of frequency modulated video signals. The couplers (52 68) further eliminate noise and are , matched resistively to the characteristic impedance of the line at the preselected frequency bands. A transmitter (54) receiver (56) and , associated circuits may also be provided at each location along the lines. The FM …
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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 June 29, 1998 and granted February 22, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2020.
- 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.