Video apparatus employing vrams
CA 1301972 C · Owner: Apple Inc. · Inventors: Farand, Tobin E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A video card using VRAMs for a computer which includes a CPU and main memory. The VRAM addresses are generated in a manner making it unnecessary to have an integer number of scan lines per memory row. A counter keeps track of the shift register position in the VRAMs and a new row address is generated in hardware independent of the scan line. A look-ahead feature detects the approaching end of the shift register data and initiates a timing sequence to reload the shift register.
Read the whole patent
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 May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- 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.