Seattle-based Impinj said Wednesday that it has raised another $19M in venture capital funding. The firm said the round came from AllianceBernstein, which led the round, as well as previous investors ARCH Venture Partners, GF Private Equity Group, Madrona Venture Group, Mobius Venture Capital, Polaris Venture Partners and strategic investors Unilever Technology Ventures, UPS Strategic Enterprise Fund, VentureTech Alliance and the Viterbi Group. Impinj is a developer of RFID semiconductors.