Apparatus for combining a video signal with graphics and text from a computer
CA 1185377 A · Owner: Digital Equipment Corporation · Inventors: Stell, Douglas E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for combining video signals from a video source, such as a video disc player (20) with computer-, generated graphics/text output on a single display for, overlaying the two. The computer-generated video is provided in RGB format (52); the other video is converted (80) to RGB format if not already in that form and the two sets of RGB signals are provided to a switch (90). The switch (90) (i.e. multiplexer3 selects which one of the two RGB signal sets to display; this selection is made separately for each pixel. In one embodiment the, color of the computer-generated signals (52) controls the switch's selection of source. A master-slave synchronization system (100) maintains …
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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 April 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 2002.
- 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.