Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 6, 2009
Patent Application Number
11622160
Date Filed
January 11, 2007
Patent Primary Examiner
Patent abstract
Semiconductor memory devices 10 are each furnished with a memory array 100 having an EEPROM array 101 and a mask ROM array 102. Identifying information for identifying each semiconductor memory device 10 is stored at the beginning three addresses of the EEPROM array 101. 8-bit data relating to ink level is stored at the ninth address to sixteenth address of the EEPROM array 101. The seventeenth address to the twenty-fourth address of the EEPROM array 101 is provided with a usage history information storage area for storing 8-bit usage history information that is rewriteable under certain conditions.
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