Management of inventory items

  • US 9,378,484 B1
  • Filed: 12/02/2014
  • Issued: 06/28/2016
  • Est. Priority Date: 12/02/2014
  • Status: Active Grant
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First Claim
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1. A computer-implemented method, comprising:

  • (a) identifying an inventory holder by reading a first radio-frequency identification (RFID) tag associated with the inventory holder, the inventory holder coupled to an autonomous mobile drive unit and comprising one or more compartments configured to receive items, the autonomous mobile drive unit configured to lift the inventory holder and to transport the inventory holder from a first position to a second position;

    (b) transmitting a radio frequency transmission via one or more antennas in a direction of the inventory holder;

    (c) receiving, by at least one reader, radio frequency responses via the one or more antennas, the radio frequency responses provided by one or more RFID tags in response to the radio frequency transmission, each RFID tag associated with an item stowed in the inventory holder;

    (d) identifying, based at least in part on the radio frequency responses, items stowed in the inventory holder;

    (e) instructing rotation of the inventory holder relative to the one or more antennas by the autonomous mobile drive unit, wherein the receiving of the radio frequency responses and the identifying of the items stowed occur at least partly during the rotation of the inventory holder by the autonomous mobile drive unit;

    (f) receiving a manifest comprising a list of manifest items expected to be stowed in the inventory holder; and

    (g) comparing the list of manifest items with the identified items stowed in the inventory holder in accordance with a confidence threshold.

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