US PATENT SUBCLASS 320 / 151
.~.~ Detection of current or voltage differential (e.g., slope, etc.)

Current as of: June, 1999
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320 /   HD   ELECTRICITY: BATTERY OR CAPACITOR CHARGING OR DISCHARGING

137  DF  BATTERY OR CELL CHARGING {11}
150  DF  .~ With thermal condition detection {3}
151.~.~ Detection of current or voltage differential (e.g., slope, etc.)

DEFINITION

Classification: 320/151

Detection of current or voltage differential (e.g., slope, etc.):

(under subclass 150) Subject matter including means to determine the time-rate-of-change of the magnitude of charging current or battery or cell voltage to determine the state of charge of the battery or cell.