US PATENT SUBCLASS 320 / 156
.~.~ 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}
155  DF  .~ Time control {2}
156.~.~ Detection of current or voltage differential (e.g., slope, etc.)

DEFINITION

Classification: 320/156

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

(under subclass 155) Subject matter including means to determine the time-rate-of-change of the magnitude of charging current or battery or cell voltage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

151, for differentiating the detected charging current or voltage to determine the state of charge in addition to detecting the thermal condition.

160, for multi-rate charging.