Display compressed image refresh system
CA 1107871 A · Owner: International Business Machines Corporation · Inventors: Chesarek, Donald J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Scanned image data is compressed and stored in a central processing unit. An image for display is recalled decompressed, and then recompressed for refresh storage for a CRT display device. The refresh compressed image is recalled when necessary for display and refresh and, directed through a plurality of parallel operated decompressors and refresh buffers to drive the display unit. An unfilled compressed refresh image store is filled with zeros to complete the display with an all white scan. In an overflow situation, a partition boundary is generated to identify that more data follows. To display the subsequent image, upon request, the overflow increment value which repeats a few scan lines …
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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 August 25, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 25, 1998.
- 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.