Background picture display apparatus and external storage unit used therefor
CA 2055718 C · Owner: Ricoh Co. Ltd. · Inventors: Miyoshi, Michitaka; Nishiumi, Satoshi; Otake, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A background picture display apparatus includes a microprocessor and an external storage unit and dot, data, character designating data and mode data are programmed in advance in a ROM in the external storage unit. Character designating data constituting background screens designated by the mode data and dot data of the respective characters used in the background screens are loaded in a RAM, that is, a screen RAM and a character RAM by a microprocessor. The character designating data is read from the screen RAM and the, dot data of the character is read from the character RAM. The dot data is converted into serial data by a parallel-serial conversion circuit, and a dot data combination …
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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 November 15, 1991 and granted September 2, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 15, 2013.
- 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.