Restricted information distribution system apparatus and methods
CA 2257658 C · Owner: Nadan, Joseph S. · Inventors: Nadan, Joseph S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Authorized decoders (60) are provided with enable reception keys (66) so that subsequently transmitted data having an information identification code matching (65) a reception key (66) at a decoder-receiver may be retrieved for subsequent display on the video screen. Tile messaging (72.1) and cellular micrographic transmission techniques are used to reduce the volume of data transmitted to change update data, wherein cells (72.1) of characters are transmitted as one byte of data and cells (72.1) of pixel data are transmitted a plurality of bytes of data. Each decoder-receiver (60) may have a plurality of video screens separately and uniquely identified such that encoded update data and …
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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 May 7, 1993 and granted September 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2015.
- 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
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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.