Television communication system for analogue and digital transmission
CA 2051420 C · Owner: Leer, Knut R. · Inventors: Gysler, Tom; Leer, Knut R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to an arrangement in a television communication system comprising a central control unit, (25) communicating with a plurality of identifiable user apparatus (TV1 TV2, etc.), and in order to provide communication of sound, text and video signals which are passed on through any existing high frequency analogue signal medium it is according to, the invention suggested that the television communication system comprises a further system providing digital one-way and/or two-way communication signals, independently of standardized analogue high frequency or television signals and providing, conversion of said digital signals to audio and/or video signals in a special …
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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 April 23, 1990 and granted June 16, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2012.
- 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.