Memory efficient apparatus and method as for a picture in a picture display
CA 2021597 A1 · Owner: Canfield, Barth Alan · Inventors: Fling, Russell Thomas; Willis, Donald Henry; Canfield, Barth Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
RCA 85,495, Abstract of the Disclosure A picture-in-a-picture television receiver includes a memory (436) for holding samples representing a vertically and horizontally compressed image. The memory is divided into three parts, a main portion which holds one field of the compressed image and first and second crossover buffers, each of which hold one line of the compressed signal. Both upper and lower field types may be derived from each field of the auxiliary signal used to produce the compressed image. Sample values are stored (432,434) into the memory such that an upper field of the compressed image is stored when an upper field of the main image is displayed and a lower field is stored …
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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 July 19, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 19, 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
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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.