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US20100239274 TONER DETERIORATION JUDGING METHOD, DEVELOPING APPARATUS AND IMAGE FORMING APPARATUS  
A toner deterioration judging method includes measuring a time taken for a recess formed on a toner surface to be evened due to flowability of the toner, and judging deterioration of the toner in...
US20150177646 DEVICE FOR CARRIER DETERIORATION ESTIMATION, IMAGE FORMING APPARATUS INCORPORATING SAME, AND IMAGE FORMING APPARATUS MANAGEMENT SYSTEM  
A device that estimates carrier deterioration indicating a degree of deterioration of carrier inside a developing device using a two-component developer includes a first carrier deterioration...
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