Patents by Inventor Francis W. Dana

Francis W. Dana has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Monitor/warranty system for electrostatographic reproducing machines using replaceable cartridges
    Patent number: 4961088
    Abstract: A monitor/warranty system for electrostatographic reproducing machines in which replaceable cartridges providing a predetermined number of images are used, each cartridge having an EEPROM programmed with a cartridge identification number that when matched with a cartridge identification number in the machine enables machine operation, a cartridge replacement warning count, and a termination count at which the cartridge is disabled from further use, the EEPROM storing updated counts of the remaining number of images left on the cartridge after each print run.
    Type: Grant
    Filed: April 20, 1989
    Date of Patent: October 2, 1990
    Assignee: Xerox Corporation
    Inventors: W. Keith Gilliland, Christian G. Midgley, Francis W. Dana, Mark C. Mutch