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The uBeam FAQ
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StillTrying:
Their updated site is definitely more uDream than uBeam.

Energous Announces the Availability of Developer Kits for Hearing Aid and PSAP Manufacturers.
https://seekingalpha.com/pr/17549013-energous-announces-availability-developer-kits-hearing-aid-psap-manufacturers

We know what happens next. :horse:

twitter.com/search?f=tweets&q=ubeam&src=typd
The_Next_Theranos:

--- Quote from: StillTrying on June 20, 2019, 12:49:59 pm ---Their updated site is definitely more uDream than uBeam.

--- End quote ---

From their web page:

--- Quote from: uDream web page ---uBeam can safely transmit watts-level power within a couple of feet, and milliwatt-level of power at tens of feet away.

--- End quote ---

Are these figures realistic?


--- Quote from: StillTrying on June 20, 2019, 12:49:59 pm ---We know what happens next. :horse:

--- End quote ---

Is this what is supposed to happen next?

https://twitter.com/meredithperry/status/656678186940411904

Maybe not...
jrs45:
I am really looking forward to ubeam powered forklifts!

PaulReynolds:

--- Quote from: The_Next_Theranos on June 20, 2019, 03:31:25 pm ---From their web page:

--- Quote from: uDream web page ---uBeam can safely transmit watts-level power within a couple of feet, and milliwatt-level of power at tens of feet away.

--- End quote ---

Are these figures realistic?

--- End quote ---

Short answer: No

Longer answer: Hell no

Much longer version: Parse the language, they 'transmit' that power within a given distance - nothing about receive or conversion to power at battery. So if I have a huge bank of speakers that I crank to 11, or a jet engine, then yes you are 'transmitting' watts of acoustic power. At 145dB, that's 300W per m^2, and the largest array I saw them show IIRC was around 30 by 30 cm (most were around 15x15). That means 30W out acoustic max at 0m at 145dB, if you stick to the international limit of more like 115dB that's 30 mW transmit so when you include 'safely' as they do, then that's the killer to that statement. You lose a bunch over distance etc, and conversion back to battery is a low %. Also the further out you go, the wider the power 'spot' size - at 30 feet the spot at 40kHz will be >10cm easily. Then there's the fact your beam will be perturbed by air currents.

So in theory yes you can, depends on size of transmitter, efficiency, allowed amplitude etc, but in practice to do so safely -  nope.
PaulReynolds:

--- Quote from: sdpkom on June 20, 2019, 08:12:37 am ---https://www.linkedin.com/in/jacquelinemccauley/

Jacqueline McCauley in no longer with uBeam.
Still on the website though....., I guess the website guy also left.

--- End quote ---

This is really, really interesting. At first we were told she became acting CEO in Sept 18 when Perry left, then her LinkedIn said July 2018 was when she took the role, now it's May 18 she took over. So Perry actually left in May 18, and they didn't want to admit it. The COO also left in May 18, after only 9 months in the company. He was someone who easily had the skillset/experience to assume the role of CEO. Might suspicious minds ask if these simultaneous departures are in some way linked?
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