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by tzs 3308 days ago
If you make a free account at deepdyve.com, you can read a free online preview of the paper for 5 minutes. The paper is only six pages long so that might be enough time to find an answer the question. (Or enough time to take six screenshots...).

I don't know any more because that was how I found that and skimmed the paper about three years ago, for a prior discussion of uBeam here on HN.