Nonvolatile memory protection arrangement for electronic postage meter system having plural nonvolatile memories
CA 1267237 C · Owner: Chang, Sung S. · Inventors: Chang, Sung S.; Kroll, Paul C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A system for the nonvolatile storage of data such as a, postage meter system, includes a microcomputer coupled to an MNOS type nonvolatile memory and also coupled to an EEPROM type nonvolatile memory, each memory having address lines and data lines. The address lines and data lines of the two nonvolatile memories are coupled to microcomputer ports such that the MNOS memory data lines are always at a high value whenever the EEPROM memory is addressed for the purpose of either writing or reading. The EEPROM nonvolatile memory control terminals and the MNOS nonvolatile memory control terminals are coupled to different ports of the microcomputer. Access to the MNOS …
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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 March 27, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2007.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.