Interactive video method and apparatus
CA 1323688 C · Owner: Broughton, Robert S. · Inventors: Laumeister, William C.; Broughton, Robert S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and apparatus for in-band video broadcasting, of commands to interactive devices are described. Control data are encoded by subliminally modulating prior to the remote, composite video broadcast of video program material a selected, sequence of video image fields. The resulting modulated video fields within the viewing area of a television each having, alternately, proportionately raised and lowered luminance horizontal scan lines, are monitored by a light sensitive device positioned adjacent the user's television screen. A semirigid twisted pair cable connects the device to nearby receiver/transmitter electronics that discriminate the binary data from the program material 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
- Granted October 26, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 26, 2010.
- 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.