Memory write protection method and apparatus
CA 2097308 A1 · Owner: Cepuran, Lawrence D. · Inventors: Cepuran, Lawrence D.; Frane, Terrie; Bengston, Dale
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A write protection apparatus is disclosed. The write protection apparatus couples a data supplying device (121) to the data input of a memory device (127). The memory protection device generates a first signal (211) which triggers generation of a second signal (215). The second signal (215) is active for a first predetermined time and is coupled to the input of the memory device (127). At any time during this first predetermined time a third signal, (209) may be generated. The third signal (209) inactivates the second signal. This third signal (209) may be triggered by numerous events including: generation of a read signal generation of a, chip select signal, or indication that the end …
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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 August 3, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2014.
- 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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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.